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

public class Main{
	public static void main(String[] args) throws IOException {
		try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		}
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main{
	public static void main(String[] args) throws IOException {
		try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		}
	}
} Main public static void main(String[] args) throws IOException {
		try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		}
	} main {
		try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		}
	} try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		} {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		} BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in)) BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in)) new BufferedReader(
				new InputStreamReader(System.in)) int a = Integer.parseInt(br.readLine()); a Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br int b = Integer.parseInt(br.readLine()); b Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br int c = Integer.parseInt(br.readLine()); c Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br int d = Integer.parseInt(br.readLine()); d Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br int e = Integer.parseInt(br.readLine()); e Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br int k = Integer.parseInt(br.readLine()); k Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br System.out.println(e-a>k?":(":"Yay!") System.out.println System.out System System.out e-a>k?":(":"Yay!" e-a>k e-a e a k ":(" "Yay!" String[] args args public class Main{
	public static void main(String[] args) throws IOException {
		try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		}
	}
} public class Main{
	public static void main(String[] args) throws IOException {
		try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		}
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main{
	public static void main(String[] args) throws IOException {
		try (BufferedReader br = new BufferedReader(
				new InputStreamReader(System.in))) {

			int a = Integer.parseInt(br.readLine());
			int b = Integer.parseInt(br.readLine());
			int c = Integer.parseInt(br.readLine());
			int d = Integer.parseInt(br.readLine());
			int e = Integer.parseInt(br.readLine());
			int k = Integer.parseInt(br.readLine());


			 System.out.println(e-a>k?":(":"Yay!");
		}
	}
}