#include<iostream> using namespace std; int main(){ int a; cin>>a; switch(a){ case 1: cout<<"NO"<<endl; break; case 2: cout<<"YES"<<endl; break; case 3: cout<<"NO"<<endl; break; case 4: cout<<"YES"<<endl; break; case 5: cout<<"NO"<<endl; break; case 6: cout<<"YES"<<endl; break; case 7: cout<<"YES"<<endl; break; } //default//其他// return 0; }