import java.util.*;

public class Main {
	public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
      	int i, limit;
     	int[] distance = new int[5];
      	for(i = 0; i < 5; i++) distance[i] = Integer.parseInt(sc.next());
      	limit = Integer.parseInt(sc.next());
      	if(distance[4] - distance[0] > limit) 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