import java.util.*;
import java.lang.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] input = new int[5];

		for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}
		System.out.println("Yay!");
	}
} import java.util.*; util.* java import java.lang.*; lang.* java public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] input = new int[5];

		for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}
		System.out.println("Yay!");
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] input = new int[5];

		for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}
		System.out.println("Yay!");
	} main {
		Scanner sc = new Scanner(System.in);
		int[] input = new int[5];

		for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}
		System.out.println("Yay!");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] input = new int[5]; input new int[5] 5 for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			input[i] = sc.nextInt();
		} {
			input[i] = sc.nextInt();
		} input[i] = sc.nextInt() input[i] input i sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		} int i = 0; int i = 0; i 0 i < input.length i input.length input input.length i++ i++ i {
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		} {
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		} for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			} int j = i + 1; int j = i + 1; j i + 1 i 1 j < input.length j input.length input input.length j++ j++ j {
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			} {
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			} if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				} input[j] - input[i] > k input[j] - input[i] input[j] input j input[i] input i 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) {
		Scanner sc = new Scanner(System.in);
		int[] input = new int[5];

		for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}
		System.out.println("Yay!");
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] input = new int[5];

		for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}
		System.out.println("Yay!");
	}
} Main
import java.util.*;
import java.lang.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] input = new int[5];

		for(int i = 0; i < 5; i++){
			input[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		for(int i = 0; i < input.length; i++){
			for(int j = i + 1; j < input.length; j++){
				if(input[j] - input[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}
		System.out.println("Yay!");
	}
}
