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