题解 正确//注意头文件

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin>>n;
if(n%30)
cout<<"3"<<" ";
if(n%50){
cout<<"5"<<" ";
}

if(n%7==0){
    cout<<"7"<<" ";
}

if(n%3!=0&&n%5!=0&&n%7!=0){
   cout<<"n"; 
}

return 0;

}