import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sca = new Scanner(System.in);
		int a = sca.nextInt(),b = sca.nextInt(),c = sca.nextInt(),d = sca.nextInt(),e = sca.nextInt(),k = sca.nextInt();
		if(e - a > 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