#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int a,b; bool c; c=true; cin>>a; for(b=2;b<a;b++){ if(a%b==0){ c=false; break;} } if(c==true) cout<<"YES"; else cout<<"NO"; return 0;cout<<b<<" "; }