#include <iostream>
using namespace std;

int main( void )
{
    int a, b, c, d, e, k;
    cin >> a >> b >> c >> d >> e >> k;
    if ( ( ( e - a ) <= ( 4 * k ) ) && ( ( d + e - a - b ) <= ( 3 * k ) ) &&
         ( ( d + e - a - b ) <= ( 2 * k ) ) && ( ( e - a ) <= ( k ) ) )
    {
        cout << "Yay!" << endl;
    }
    else
    {
        cout << ":(" << endl;
    }

    return 0;
}

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main()
{
  vector<int> a(5);
  rep(i, 5) cin >> a[i];

  int k;
  cin >> k;

  for (int i = 0; i < 5;i ++){
    for (int j = i+1; j < 5; j++){
      if(abs(a.at(i)-a.at(j)) >k){
        cout << ":(";
            return 0;
      }
    }
  }
  cout << "Yay!";
}
