题解

#include<iostream>>
using namespace std;
int main(){
    int x;
    cin>>x;
    if(x%3==0){
        cout<<3<<" ";
    }if(x%5==0){
        cout<<5<<" ";
    }if(x%7==0){
        cout<<7<<" ";
    }if(x%3!=0&&x%5!=0&&x%7!=0){
        cout<<"n";
    }
    return 0;
}