#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;
        }

        // write your code here......
        bool operator <(Time t)//利用bool类型进行判断,时间小于6小时6分的返回ture
        {
            if(this->hours<t.hours)
            {
                return true;
            }
            if(this->hours==t.hours&&this->minutes<t.minutes)
            {
                return true;
            }
            return false;
        }
};

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;
}