#include<iostream> uslng namespace std; int main(){ int a; cin>>a; switch(a){ case 1: cout<<"no"; break; case 3: cout<<"no"; break; case 5: cout<<"no"; break; case 2: cout<<"yes"; break; case 4: cout<<"yes"; break; case 6: cout<<"yes"; break; case 7: cout<<"yes"; break; return 0; }