#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) {
if (hours < t.hours) {
return true;
} else if (hours > t.hours) {
return false;
} else {
if (minutes < t.minutes) {
return true;
} 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;
}