import java.util.Scanner;
 
public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int[] num = new int[5];
		for(int i=0; i<5; i++) {
			num[i]=sc.nextInt();
		}
		int k=sc.nextInt();
		if(num[4]-num[0]>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