import java.util.Scanner;

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

		int[] ant = new int[5];
		int dis = 0;

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

		for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		}
		System.out.println("Yay!");
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int[] ant = new int[5];
		int dis = 0;

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

		for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		}
		System.out.println("Yay!");
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int[] ant = new int[5];
		int dis = 0;

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

		for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		}
		System.out.println("Yay!");
	} main {
		Scanner sc = new Scanner(System.in);

		int[] ant = new int[5];
		int dis = 0;

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

		for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		}
		System.out.println("Yay!");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] ant = new int[5]; ant new int[5] 5 int dis = 0; dis 0 for(int i = 0; i < 5; i++) {
			ant[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			ant[i] = sc.nextInt();
		} {
			ant[i] = sc.nextInt();
		} ant[i] = sc.nextInt() ant[i] ant i sc.nextInt() sc.nextInt sc dis = sc.nextInt() dis sc.nextInt() sc.nextInt sc for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		} int i = 0; int i = 0; i 0 i < 4 i 4 i++ i++ i {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		} {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		} for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			} int j = i + 1; int j = i + 1; j i + 1 i 1 j < 5 j 5 j++ j++ j {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			} {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			} if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				} ant[j] - ant[i] > dis ant[j] - ant[i] ant[j] ant j ant[i] ant i dis {
					System.out.println(":(");
					System.exit(0);
				} System.out.println(":(") System.out.println System.out System System.out ":(" System.exit(0) System.exit System 0 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[] ant = new int[5];
		int dis = 0;

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

		for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		}
		System.out.println("Yay!");
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int[] ant = new int[5];
		int dis = 0;

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

		for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		}
		System.out.println("Yay!");
	}
} Main
import java.util.Scanner;

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

		int[] ant = new int[5];
		int dis = 0;

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

		for(int i = 0; i < 4; i++) {
			for(int j = i + 1; j < 5; j++) {
				if(ant[j] - ant[i] > dis) {
					System.out.println(":(");
					System.exit(0);
				}
			}
		}
		System.out.println("Yay!");
	}
}