diff --git "a/YoungjinShin/3\354\243\274\354\260\250/mathTest.java" "b/YoungjinShin/3\354\243\274\354\260\250/mathTest.java"
new file mode 100644
index 0000000..1e10676
--- /dev/null
+++ "b/YoungjinShin/3\354\243\274\354\260\250/mathTest.java"
@@ -0,0 +1,53 @@
+import java.util.*;
+
+
+public class mathTest{
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        int testCase = sc.nextInt();
+        int[] answer = new int[testCase];
+        for(int i = 0; i<testCase; i++){
+            answer[i] = sc.nextInt();
+        }
+        sc.close();
+        int[] ret = solution(answer);
+        System.out.print("[");
+        for(int i = 0; i<ret.length; i++){
+            System.out.print(ret[i]);
+        } 
+        System.out.println("]");
+        
+    }
+
+    public static int[] solution(int[] answers) {
+        int[] student1 = {1,2,3,4,5};
+        int[] student2 = {2,1,2,3,2,4,2,5};
+        int[] student3 = {3,3,1,1,2,2,4,4,5,5};
+        int[] ansCount  = {0,0,0};
+        
+        for (int i = 0; i< answers.length; i++){
+            if (student1[(i % student1.length)] == answers[i]){
+                ansCount[0] ++;
+            }
+            if (student2[i%student2.length] == answers[i]){
+                ansCount[1] ++;
+            }
+            if (student3[i%student3.length] == answers[i]){
+                ansCount[2] ++;
+            }
+        }
+
+        List<Integer> tempanswer = new ArrayList<>();
+        
+        int max = Arrays.stream(ansCount).max().getAsInt();
+        
+        for (int i = 0; i < ansCount.length; i++){
+            if (ansCount[i] == max){
+                tempanswer.add(i+1);
+            }
+        }
+        int[] answer = tempanswer.stream().mapToInt(i -> i).toArray();
+    
+        return answer;
+    }
+}
\ No newline at end of file