import java.util.*;

public class Main{

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int[] dist =new int[5];
		for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		}
		int limit =sc.nextInt();

		if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
}
/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