#include<iostream> using namespace std; int main(){ int a; cin>>a; switch(a){ case 1: //a>=90; cout<<"NO"; break; case 2: //90>a>=80; cout<<"YES"; break; case 3: //80>a>=70; cout<<"NO"; break; case 4: //70>a>=60; cout<<"YES"; break; case 5: //60>a; cout<<"NO"; break; case 6: //60>a; cout<<"YES"; break; case 7: //60>a; cout<<"YES"; break; default: break; } return 0; }