import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int [] a = new int[4];
        for(int i =0; i<4; i++)
        { a[i] = sc.nextInt();}
		int e = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		for(int i =0; i<4; i++)
        {if(e-a[i]>k) 
        {System.out.println(":(");
        System.exit(0);}
        }
		
		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