

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

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

		for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}

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

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

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

		for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}

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

} Main public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

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

		for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}

		System.out.println("Yay!");
	} main {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

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

		for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}

		System.out.println("Yay!");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a[] = new int[5]; a new int[5] 5 for(int i = 0; i < 5; i++){
			a[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			a[i] = sc.nextInt();
		} {
			a[i] = sc.nextInt();
		} a[i] = sc.nextInt() a[i] a i sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		} {
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		} for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			} int j = i + 1; int j = i + 1; j i + 1 i 1 j < 5 j 5 j++ j++ j {
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			} {
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			} if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				} a[j] - a[i] > k a[j] - a[i] a[j] a j a[i] a 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) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

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

		for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}

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

} public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

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

		for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}

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

} Main


import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

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

		for(int i = 0; i < 5; i++){
			for(int j = i + 1; j < 5; j++){
				if(a[j] - a[i] > k){
					System.out.println(":(");
					return;
				}
			}
		}

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

}
