import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner sc = new Scanner(System.in);
      
		int A=sc.nextInt();
		int B=sc.nextInt();
		int C=sc.nextInt();
		int D=sc.nextInt();
		int E=sc.nextInt();
		int K=sc.nextInt();
		
		System.out.println(E - A <= K ? "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