#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<(const Time& t2)
        {
            return hours<t2.hours || 
            hours==t2.hours && minutes < t2.minutes;//两种情况,不成立则返回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;
}

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