#include<iostream>     
using namespace std;     
    
int main(){
    long int i,n;
    while (cin >> i){
          if (i==1){
              cout << "非質數" << endl;
          }
          else if (i==2){
              cout << "質數" << endl;
          }
          else{
              for (n=2;n<=i-1;n++){
                  if (i%n==0){
                      cout << "非質數" << endl;
                      break;
                  }
                  else if (i%n!=0 && n==i-1){
                      cout << "質數" << endl;
                  }
              }    
          }
          
    }
    return 0;
}

順便請各位幫我看看有哪裡錯~謝謝！