#include<bits/stdc++.h>
using namespace std;
double s,x,w,q=7;
char sum;
int main()
{ cin>>s>>x;
while (1+1==2){
if(w>=s-x){
if(s+x<w+q0.98){
sum = 'n'; break;
}else{
sum='y';break;
}
}
w+=q;q=0.98; }cout<<sum<<"\n";
return 0;
}