#include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n; cin>>n; int i=2; /* bool f=0; while(i*i,=n){//i<=sqrt(n) if(n%i==0) {f=1;break;} i++; } if(f==0){ cout<<"Yes"<<endl; } else{ cout<<"No"<<endl; } */ int cnt=2; i=2; do{ if(n%i==0) cnt++; i++; }while(i*i<=n); if(cnt>=3) cout<<"No"<<endl; else cout<<"Yes"<<endl; return 0; }