import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int min = sc.nextInt();
		int max = min;
		for (int i = 0; i < 4; i++) {
			int num = sc.nextInt();
			if (num < min) {
				min = num;
			} else {
				if (num > max) {
					max = num;
				}
			}
		}
		int dif = max - min;
		if (dif > sc.nextInt()) {
			System.out.println(":(");
		} else {
			System.out.println("Yay!");
		}
		sc.close();
	}
}
/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