答案（求赞！！！！！！！）

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