#include <bits/stdc++.h>
using namespace std;

int main() {
  vector<int> V(5);
  for (int i=0; i<5; i++) {
    cin >> V[i];
  }
  int k;
  cin >> k;
  if (V[4]-V[0]>k) {
    cout << ":(" << endl;
  }
  else {
    cout << "Yay!" << endl;
  }
}

#include<bits/stdc++.h>
#define ll long long int

using namespace std;

const ll mod=1000000007;
const ll inf=1e18;

int main(){

  ll a,b,c,d,e,k;
  cin >> a >> b >> c >> d >> e >> k;
  if(e-a<=k)cout << "Yay!" << endl;
  else cout << ":(" << endl;


}