
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int[] distance = new int[5];
		for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		int count = 0;
		boolean flag = true;

		for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		}
		if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		}

	}

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

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int[] distance = new int[5];
		for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		int count = 0;
		boolean flag = true;

		for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		}
		if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		}

	}

} Main public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int[] distance = new int[5];
		for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		int count = 0;
		boolean flag = true;

		for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		}
		if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		}

	} main {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int[] distance = new int[5];
		for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		int count = 0;
		boolean flag = true;

		for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		}
		if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] distance = new int[5]; distance new int[5] 5 for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			distance[i] = sc.nextInt();
		} {
			distance[i] = sc.nextInt();
		} distance[i] = sc.nextInt() distance[i] distance i sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc int count = 0; count 0 boolean flag = true; flag true for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		} int i = distance.length - 1; int i = distance.length - 1; i distance.length - 1 distance.length distance distance.length 1 i >= 0 i 0 i-- i-- i {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		} {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		} for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			} int j = i-1; int j = i-1; j i-1 i 1 j >= 0 j 0 j-- j-- j {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			} {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			} if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				} k < distance[i] - distance[j] k distance[i] - distance[j] distance[i] distance i distance[j] distance j {
					flag = false;
					break;
				} flag = false flag false break; if(!flag) {
				break;
			} !flag flag {
				break;
			} break; if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		} flag {
			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) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int[] distance = new int[5];
		for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		int count = 0;
		boolean flag = true;

		for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		}
		if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		}

	}

} public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int[] distance = new int[5];
		for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		int count = 0;
		boolean flag = true;

		for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		}
		if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		}

	}

} Main

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int[] distance = new int[5];
		for(int i = 0; i < 5; i++) {
			distance[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		int count = 0;
		boolean flag = true;

		for(int i = distance.length - 1; i >= 0; i--) {
			for(int j = i-1; j >= 0; j--) {
//				System.out.println(k);
//				System.out.println(distance[i]);
//				System.out.println(distance[j]);
//				System.out.println();
				if(k < distance[i] - distance[j]) {
					flag = false;
					break;
				}
			}
			if(!flag) {
				break;
			}

		}
		if(flag) {
			System.out.println("Yay!");
		}
		else {
			System.out.println(":(");
		}

	}

}
