
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	} main {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int e = sc.nextInt(); e sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc int[] antenas = {a,b,c,d,e}; antenas {a,b,c,d,e} a b c d e boolean connect = true; connect true String output = connect ? "Yay!" : ":("; output connect ? "Yay!" : ":(" connect "Yay!" ":(" System.out.println(output) System.out.println System.out System System.out output String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	}
} Main

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	}
}
