#include<bits/stdc++.h> using namespace std; int n1,n2=1,n3,n4; int main (){ cin>>n1; if(n1==2){ cout<<"Yes"; return 0; }else if(n1==1){ cout<<"Yes"; return 0; } n4=n1; while(n4){ if(n1%n2==0){ n3++; } n4--; n2++; } if(n3==2){ cout<<"Yes"; }else{ cout<<"No"; } return 0; }