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

public class Main {

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

		int a[] = new int[5];

		for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		}
		int k = Integer.parseInt(br.readLine());

		if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		}

		System.out.println("Yay!");
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.Arrays; Arrays java.util public class Main {

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

		int a[] = new int[5];

		for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		}
		int k = Integer.parseInt(br.readLine());

		if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		}

		System.out.println("Yay!");
	}
} Main public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		int a[] = new int[5];

		for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		}
		int k = Integer.parseInt(br.readLine());

		if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		}

		System.out.println("Yay!");
	} main {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		int a[] = new int[5];

		for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		}
		int k = Integer.parseInt(br.readLine());

		if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		}

		System.out.println("Yay!");
	} BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) int a[] = new int[5]; a new int[5] 5 for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			a[i] = Integer.parseInt(br.readLine());
		} {
			a[i] = Integer.parseInt(br.readLine());
		} a[i] = Integer.parseInt(br.readLine()) a[i] a i 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 if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		} a[4] - a[0] > k a[4] - a[0] a[4] a 4 a[0] a 0 k {
			System.out.println(":(");
			return;
		} System.out.println(":(") System.out.println System.out System System.out ":(" return; System.out.println("Yay!") System.out.println System.out System System.out "Yay!" String[] args args public class Main {

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

		int a[] = new int[5];

		for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		}
		int k = Integer.parseInt(br.readLine());

		if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		}

		System.out.println("Yay!");
	}
} public class Main {

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

		int a[] = new int[5];

		for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		}
		int k = Integer.parseInt(br.readLine());

		if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		}

		System.out.println("Yay!");
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {

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

		int a[] = new int[5];

		for (int i = 0; i < 5; i++) {
			a[i] = Integer.parseInt(br.readLine());
		}
		int k = Integer.parseInt(br.readLine());

		if (a[4] - a[0] > k) {
			System.out.println(":(");
			return;
		}

		System.out.println("Yay!");
	}
}
