What's wrong,What exactly do you want the output?

public static void main(String[] args) throws Exception {
       //在此编写你的代码
       while (true) {
           BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
           int num1 = Integer.parseInt(br.readLine());
           int num2 = Integer.parseInt(br.readLine());
           int num3 = Integer.parseInt(br.readLine());

           if (num1 == num2 && num2 != num3) {
               System.out.println("3");
           } else if (num1 == num3 && num3 != num2) {
               System.out.println("2");
           } else if (num2 == num3 && num3 != num1) {
               System.out.println("1");
           }
       }
   }