#include<bits/stdc++.h>
using namespace std;
int main(){
	int s,x,a=7,b=0;
	cin>>s>>x;
	while(b<s-x){
		b=b+a;
		s=s-a;
		a=a*0.98;
	}
	if(a*0.98<=s+x)cout<<"y";
	else
		cout<<"n";
	return 0;
}