#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,i=2; cin>>n; while(i<n){ if(n%i==0){ cout<<"No"; return 0; } i++; } cout<<"Yes"; return 0; }