import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args){
		try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
} Main public static void main(String[] args){
		try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		}
	} main {
		try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		}
	} try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		} catch (Exception e) {
			// TODO: handle exception
		} Exception e {
			// TODO: handle exception
		} {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} Scanner in = new Scanner(System.in) Scanner in = new Scanner(System.in) new Scanner(System.in) int[] antena = new int[5]; antena new int[5] 5 for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
				antena[i] = Integer.parseInt(in.next());
			} {
				antena[i] = Integer.parseInt(in.next());
			} antena[i] = Integer.parseInt(in.next()) antena[i] antena i Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in int k = Integer.parseInt(in.next()); k Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			} {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			} int antena_i = antena[i]; antena_i antena[i] antena i for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				} int comp = i; int comp = i; comp i comp < 5 comp 5 comp++ comp++ comp {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				} {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				} int dist = antena[comp] - antena_i; dist antena[comp] - antena_i antena[comp] antena comp antena_i if (k < dist) {
						System.out.println(":(");
						return;
					} k < dist k dist {
						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){
		try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
} public class Main {
	public static void main(String[] args){
		try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		try (Scanner in = new Scanner(System.in)) {
			int[] antena = new int[5];
			for (int i = 0; i < 5; i++) {
				antena[i] = Integer.parseInt(in.next());
			}
			int k = Integer.parseInt(in.next());
			
			for (int i = 0; i < 5; i++) {
				int antena_i = antena[i];
				for (int comp = i; comp < 5; comp++) {
					int dist = antena[comp] - antena_i;
					if (k < dist) {
						System.out.println(":(");
						return;
					}
				}
			}
			System.out.println("Yay!");
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
}
