import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
      	Integer a = sc.nextInt();
      	Integer b = sc.nextInt();
      	Integer c = sc.nextInt();
      	Integer d = sc.nextInt();
      	Integer e = sc.nextInt();
      	Integer k = sc.nextInt();
		if((e-a) > 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