#include<bits/stdc++.h> using namespace std; int n,i,sum,j; int yue(int n){ j=2; while(n%j!=0){ j++; } return j; } int main(){ cin>>n; if(n%2!=0&&n%3!=0&&n%5!=0&&n%7!=0&&n!=1||n==2||n==3||n==5||n==7){ cout<<"Yes"; }else{ cout<<yue(n); } }