华为机试测试-找偶数的相距最近的素数对

import java.util.Scanner;
public class Main{
      public static void main(String[] args){
          Scanner scanner=new Scanner(System.in);
          int n=scanner.nextInt();
          for(int i=n/2;i>=2;i--)
          {
              if(isSushu(i) && isSushu(n-i))
              {
                  System.out.println(i);
                  System.out.println(n-i);
                  break;
              }
          }
          scanner.close();
      } 
      public static boolean isSushu(int x)
      {
          if(x==1) return false;
          if(x==2 || x==3 || x==5 || x==7) return true;
          if(x%2==0 || x%3==0 || x%5==0 || x%7==0) return false;
          for(int i=3;i<x/2;i++)
          {
              if(x%i==0)
              {
                  return false;
              }
          }
          return true;
      }
}