import java.util.*;

public class Main {
	public static void main(String[] args){
		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();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args){
		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();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} Main public static void main(String[] args){
		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();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	} main {
		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();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	} 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 int judge = 1; judge 1 for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		} int i = 0; int i = 0; i 0 i < 4 i 4 i++ i++ i {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		} {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		} for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			} 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) {
					judge--;
				}
			} {
				if (a[j] - a[i] > k) {
					judge--;
				}
			} if (a[j] - a[i] > k) {
					judge--;
				} a[j] - a[i] > k a[j] - a[i] a[j] a j a[i] a i k {
					judge--;
				} judge-- judge if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		} judge == 1 judge 1 {
			System.out.println("Yay!");
		} System.out.println("Yay!") System.out.println System.out System System.out "Yay!" {
			System.out.println(":(");
		} System.out.println(":(") System.out.println System.out System System.out ":(" String[] args args public class Main {
	public static void main(String[] args){
		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();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} public class Main {
	public static void main(String[] args){
		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();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} Main
import java.util.*;

public class Main {
	public static void main(String[] args){
		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();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
}