#include <bits/stdc++.h> 
#include <vector>
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define size_of_array(array) (sizeof(array)/sizeof(array[0]))
using ll =long long;
using namespace std;
using Graph=vector<vector<int>>;
using Field=vector<vector<int>>;

template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}

int main(){
    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(a[j]-a[i]>k){
                cout<<":("<<endl;
                return 0;
            }
        }
    }
    cout<<"Yay!"<<endl;
}


// lcmとか__builtin_popcountとかはg++ -std=c++17 default.cppみたいなかんじで

#include <bits/stdc++.h>
#define mod 1000000007
#define INF LLONG_MAX
#define ll long long
#define ln cout<<endl
#define Yes cout<<"Yes"<<endl
#define NO cout<<"NO"<<endl
#define YES cout<<"YES"<<endl
#define No cout<<"No"<<endl
#define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++)
#define rep(i,n) REP(i,0,n)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
using namespace std;
ll dx[4]={1,0,-1,0};
ll dy[4]={0,1,0,-1};
vector< ll > divisor(ll n) {
  vector< ll > ret;
  for(ll i = 1; i * i <= n; i++) {
    if(n % i == 0) {
      ret.push_back(i);
      if(i * i != n) ret.push_back(n / i);
    }
  }
  sort(begin(ret), end(ret));
  return (ret);
}

int main() {
    cin.tie(0);
   	ios::sync_with_stdio(false);

    ll  a,b,c,d,e,n,k,maxi=0,f=0,mini=INF,sum=0,q;
	string str,stra,straa;
    ll x,y,z;
    char ca,cb,cc;
    cin>>a>>b>>c>>d>>e>>k;
    if(e-a>k)cout<< ":("<<endl;
    else cout<<"Yay!"<<endl;


    

    return 0;
}
