题解在此

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