diff --git a/ahma0/BOJ_1027.java b/ahma0/BOJ_1027.java
new file mode 100644
index 0000000..693a0ec
--- /dev/null
+++ b/ahma0/BOJ_1027.java
@@ -0,0 +1,37 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.StringTokenizer;
+
+public class Main {
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int x = Integer.parseInt(st.nextToken());
+        int y = Integer.parseInt(st.nextToken());
+        int z = getPercent(x, y);
+
+        int ans = -1;
+        int left = 0;
+        int right = (int) 1e9;
+        while (left <= right) {
+            int mid = (left + right) / 2;
+
+            if (getPercent(x + mid, y + mid) != z) {
+                ans = mid;
+                right = mid - 1;
+            } else {
+                left = mid + 1;
+            }
+        }
+        System.out.println(ans);
+        br.close();
+    }
+
+    private static int getPercent(int x, int y) {
+        return (int) ((long) y * 100 / x);
+    }
+
+}
+