#include <iostream>
using namespace std;
int main(void)
{
    int s, x;
    cin >> s >> x;
    double M = 0;        
    double speed = 7;        
    bool stop = false;    
    do
    {
        if (M >= s - x && M <= s + x)        
        {
            if (stop)        
            {
                cout << 'n' << endl;
                break;
            }
            stop = true;        
        }
        else if (stop)
        {
            cout << 'y' << endl;
            break;
        }
        else
        {
            M += speed;
            speed *= 0.98;
        }
    } while (true);
    return 0;
}