#include <iostream>
using namespace std;

class Time {

    public:
        int hours;      // 小时
        int minutes;    // 分钟

        Time() {
            hours = 0;
            minutes = 0;
        }

        Time(int h, int m) {
            this->hours = h;
            this->minutes = m;
        }

        void show() {
            cout << hours << " " << minutes << endl;
        }

        bool operator<(Time p){//<指的是小于号的重载
            if(this->hours<p.hours){
                return true;
            }else if(this->hours==p.hours&&this->minutes<p.minutes){
                return true;
            }else{
                return false;
            }
        }//运用bool函数,判断是否正确

};

int main() {
    int h, m;
    cin >> h;
    cin >> m;

    Time t1(h, m);
    Time t2(6, 6);
	
    if (t1<t2) cout<<"yes"; else cout<<"no";
    return 0;
}