80分

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