import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        
        int min = Integer.MAX_VALUE;
        int max = Integer.MIN_VALUE;
        for(int i = 0; i < 5; i++) {
            int n = sc.nextInt();
            min = Math.min(min, n);
            max = Math.max(max, n);
        }

        int k = sc.nextInt();
        if(max - min > k)
            System.out.println(":(");
        else
            System.out.println("Yay!");
    }
}

/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