#include "bits/stdc++.h"
using namespace std;
#define int long long
#define endl '\n'
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

signed main(){
	int a,b,c,d,e,k;
	cin>>a>>b>>c>>d>>e>>k;
	int x=e-a;
	if(x>k)cout<<":("<<endl;
	else cout<<"Yay!"<<endl;
}

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