import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		int count = 0;
		int X[] = new int[5];
		int d = 0;
		
		for (int i = 0; i < 5; i++) {
			int x = scanner.nextInt();
			X[i] = x;
		}
		int k = scanner.nextInt();
		
		for (int m = 4; m > 0; m--) {
			for (int n = 0; n < m; n++) {
				d = X[m] - X[n];
				//System.out.println(d);
			if (d > k) {
				count += 1;
			}
			}
		}
		//System.out.println("countは"+count);
		if (count != 0) {
			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