#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<(const Time& time) const {
        if (this->hours < time.hours)
            return true;
        else if (this->hours == time.hours) {
            if (this->minutes < time.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;
}