AC

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