
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	static int[][] memo;

	public static int hoge(int current, int n, String last) {
		return 0;
	}

	public static void main(String[] args) throws IOException {
		BufferedReader bf = null;
		bf = new BufferedReader(new InputStreamReader(System.in));
		int a,e,k;
		String str;
		str = bf.readLine();
		a = Integer.parseInt(str);
		str = bf.readLine();
		str = bf.readLine();
		str = bf.readLine();
		str = bf.readLine();
		e = Integer.parseInt(str);
		str = bf.readLine();
		k = Integer.parseInt(str);
		if(e-a <= k) {
			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