import java.util.Scanner;

public class Main {

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

		// 整数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		String ret = ":(";

		if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		sc.close();
	}
} import java.util.Scanner; Scanner java.util public class Main {

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

		// 整数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		String ret = ":(";

		if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		sc.close();
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		// 整数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		String ret = ":(";

		if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		sc.close();
	} main {
		Scanner sc = new Scanner(System.in);

		// 整数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		String ret = ":(";

		if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		sc.close();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int e = sc.nextInt(); e sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc String ret = ":("; ret ":(" if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		} b - a > k b - a b a k {
			System.out.println(ret);
		} System.out.println(ret) System.out.println System.out System System.out ret {
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		} if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			} c - a > k c - a c a k {
				System.out.println(ret);
			} System.out.println(ret) System.out.println System.out System System.out ret {
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			} if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				} d - a > k d - a d a k {
					System.out.println(ret);
				} System.out.println(ret) System.out.println System.out System System.out ret {
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				} if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					} e - a > k e - a e a k {
						System.out.println(ret);
					} System.out.println(ret) System.out.println System.out System System.out ret {
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					} if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						} c - b > k c - b c b k {
							System.out.println(ret);
						} System.out.println(ret) System.out.println System.out System System.out ret {
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						} if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							} d - b > k d - b d b k {
								System.out.println(ret);
							} System.out.println(ret) System.out.println System.out System System.out ret {
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							} if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								} e - b > k e - b e b k {
									System.out.println(ret);
								} System.out.println(ret) System.out.println System.out System System.out ret {
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								} if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									} d - c > k d - c d c k {
										System.out.println(ret);
									} System.out.println(ret) System.out.println System.out System System.out ret {
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									} if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										} e - c > k e - c e c k {
											System.out.println(ret);
										} System.out.println(ret) System.out.println System.out System System.out ret {
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										} if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											} e - d > k e - d e d k {
												System.out.println(ret);
											} System.out.println(ret) System.out.println System.out System System.out ret {
												System.out.println("Yay!");
											} System.out.println("Yay!") System.out.println System.out System System.out "Yay!" sc.close() sc.close sc String[] args args public class Main {

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

		// 整数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		String ret = ":(";

		if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		sc.close();
	}
} public class Main {

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

		// 整数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		String ret = ":(";

		if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		sc.close();
	}
} Main
import java.util.Scanner;

public class Main {

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

		// 整数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		String ret = ":(";

		if(b - a > k){
			System.out.println(ret);
		}else{
			if(c - a > k){
				System.out.println(ret);
			}else{
				if(d - a > k){
					System.out.println(ret);
				}else{
					if(e - a > k){
						System.out.println(ret);
					}else{
						if(c - b > k){
							System.out.println(ret);
						}else{
							if(d - b > k){
								System.out.println(ret);
							}else{
								if(e - b > k){
									System.out.println(ret);
								}else{
									if(d - c > k){
										System.out.println(ret);
									}else{
										if(e - c > k){
											System.out.println(ret);
										}else{
											if(e - d > k){
												System.out.println(ret);
											}else{
												System.out.println("Yay!");
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		sc.close();
	}
}
