import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args)throws IOException {
        Scanner sc = new Scanner(System.in);
        //BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        //PrintWriter out = new PrintWriter(System.out);
        int[] a = new int[5];
        for(int i=0;i<5;i++) a[i]= sc.nextInt();
        int k = sc.nextInt();
        String ans = a[4]-a[0]<=k?"Yay!":":(";
        System.out.println(ans);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz