diff --git a/src/main/java/com/doit/algorithm/kdg/Main.java b/src/main/java/com/doit/algorithm/kdg/Main.java
new file mode 100644
index 0000000..ccf43d4
--- /dev/null
+++ b/src/main/java/com/doit/algorithm/kdg/Main.java
@@ -0,0 +1,97 @@
+package com.doit.algorithm.kdg;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.util.StringTokenizer;
+
+public class Main {
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int n = Integer.parseInt(st.nextToken());       // 9
+        int len = Integer.parseInt(st.nextToken());     // 8
+        String words = br.readLine();                   // DNA 문자열
+        String s = br.readLine();                       // 포함 갯수
+
+        int result = solution(n, len, words, s);
+
+        System.out.println(result);
+    }
+
+    public static int solution(int n, int len, String s, String max) {
+        int result = 0;
+        char[] words = new char[n];
+        int[] includes = new int[4];
+        int[] myIncludes = new int[4];
+
+        for (int i = 0; i < s.length(); i++) {
+            words[i] = s.charAt(i);
+        }
+
+        String[] split = max.split(" ");
+        for (int i = 0; i < split.length; i++) {
+            includes[i] = Integer.parseInt(split[i]);
+        }
+
+        char[] move = move(0, len, words);
+        add(move, myIncludes);
+        boolean checked = checked(myIncludes, includes);
+        if (checked) result++;
+
+        for (int i = len; i < n; i++) {
+            int next = n - len;
+            move = move(next, len, words);
+            init(myIncludes);
+            add(move, myIncludes);
+            checked = checked(myIncludes, includes);
+            if (checked) result++;
+        }
+
+        return result;
+    }
+
+    private static char[] move(int start, int end, char[] words) {
+        char[] result = new char[end];
+        int index = 0;
+
+        for (int i = start; i < start + end; i++) {
+            result[index++] = words[i];
+        }
+        return result;
+    }
+
+    private static void add(char[] move, int[] myIncludes) {
+        for (int i = 0; i < move.length; i++) {
+            switch (move[i]) {
+                case 'A':
+                    myIncludes[0]++;
+                    break;
+                case 'C':
+                    myIncludes[1]++;
+                    break;
+                case 'G':
+                    myIncludes[2]++;
+                    break;
+                case 'T':
+                    myIncludes[3]++;
+                    break;
+                default:
+                    throw new IllegalArgumentException();
+            }
+        }
+    }
+
+    private static void init(int[] myIncludes) {
+        for (int i = 0; i < myIncludes.length; i++) {
+            myIncludes[i] = 0;
+        }
+    }
+
+    private static boolean checked(int[] myIncludes, int[] includes) {
+        return myIncludes[0] == includes[0] &&
+                myIncludes[1] == includes[1] &&
+                myIncludes[2] == includes[2] &&
+                myIncludes[3] == includes[3];
+    }
+}
diff --git a/src/main/java/com/doit/algorithm/kdg/Problem009.java b/src/main/java/com/doit/algorithm/kdg/Problem009.java
new file mode 100644
index 0000000..61c78a9
--- /dev/null
+++ b/src/main/java/com/doit/algorithm/kdg/Problem009.java
@@ -0,0 +1,80 @@
+package com.doit.algorithm.kdg;
+
+public class Problem009 {
+
+    public static int solution(int n, int len, String s, String max) {
+        int result = 0;
+        char[] words = new char[n];
+        int[] includes = new int[4];
+        int[] myIncludes = new int[4];
+
+        for (int i = 0; i < s.length(); i++) {
+            words[i] = s.charAt(i);
+        }
+
+        String[] split = max.split(" ");
+        for (int i = 0; i < split.length; i++) {
+            includes[i] = Integer.parseInt(split[i]);
+        }
+
+        char[] move = move(0, len, words);
+        add(move, myIncludes);
+        boolean checked = checked(myIncludes, includes);
+        if (checked) result++;
+
+        for (int i = len; i < n; i++) {
+            int next = n - len;
+            move = move(next, len, words);
+            init(myIncludes);
+            add(move, myIncludes);
+            checked = checked(myIncludes, includes);
+            if (checked) result++;
+        }
+
+        return result;
+    }
+
+    private static char[] move(int start, int end, char[] words) {
+        char[] result = new char[end];
+        int index = 0;
+
+        for (int i = start; i < start + end; i++) {
+            result[index++] = words[i];
+        }
+        return result;
+    }
+
+    private static void add(char[] move, int[] myIncludes) {
+        for (int i = 0; i < move.length; i++) {
+            switch (move[i]) {
+                case 'A':
+                    myIncludes[0]++;
+                    break;
+                case 'C':
+                    myIncludes[1]++;
+                    break;
+                case 'G':
+                    myIncludes[2]++;
+                    break;
+                case 'T':
+                    myIncludes[3]++;
+                    break;
+                default:
+                    throw new IllegalArgumentException();
+            }
+        }
+    }
+
+    private static void init(int[] myIncludes) {
+        for (int i = 0; i < myIncludes.length; i++) {
+            myIncludes[i] = 0;
+        }
+    }
+
+    private static boolean checked(int[] myIncludes, int[] includes) {
+        return myIncludes[0] == includes[0] &&
+                myIncludes[1] == includes[1] &&
+                myIncludes[2] == includes[2] &&
+                myIncludes[3] == includes[3];
+    }
+}
diff --git a/src/test/java/com/doit/algorithm/kdg/Problem009Test.java b/src/test/java/com/doit/algorithm/kdg/Problem009Test.java
new file mode 100644
index 0000000..ce7ba44
--- /dev/null
+++ b/src/test/java/com/doit/algorithm/kdg/Problem009Test.java
@@ -0,0 +1,32 @@
+package com.doit.algorithm.kdg;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class Problem009Test {
+
+    @Test
+    void solution_1() {
+        int n = 9;
+        int len = 8;
+        String s = "CCTGGATTG";
+        String includes = "2 0 1 1";
+
+        int result = Problem009.solution(n, len, s, includes);
+
+        assertThat(result).isEqualTo(0);
+    }
+
+    @Test
+    void solution_2() {
+        int n = 4;
+        int len = 2;
+        String s = "GATA";
+        String includes = "1 0 0 1";
+
+        int result = Problem009.solution(n, len, s, includes);
+
+        assertThat(result).isEqualTo(2);
+    }
+}