#include<bits/stdc++.h>
using namespace std;
long long sum,s,x,v=7;//s距离，x范围
//------XXX------ 
//一开始不在危险区域 
int main(){
	cin>>s>>x;
	while(sum<s-x){
		sum+=v;
		v*=0.98;
	}
	if(sum+0.98*v<=s+x) cout<<"y";
	else cout<<"n";
	return 0;
}