#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......
//重载为类的成员函数
bool operator <(Time t)
{
//两种情况
if((hours<t.hours)||((hours==t.hours)&&(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;
}