#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 &t2)
        {
            string a;
            if(this->hours<t2.hours)
            {
                return true;
            }
            else if(this->hours==t2.hours)
            {
                if(this->minutes<t2.minutes)
                {
                    return true;

                }
                else{
                    return false;
                }
            }
            else
            {
                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;
}