import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
    
		// 整数の入力
        int[] list = new int[5];
        for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        String ans = "Yay!";
        for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        }
              
		// 出力
		System.out.println(ans);
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
    
		// 整数の入力
        int[] list = new int[5];
        for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        String ans = "Yay!";
        for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        }
              
		// 出力
		System.out.println(ans);
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
    
		// 整数の入力
        int[] list = new int[5];
        for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        String ans = "Yay!";
        for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        }
              
		// 出力
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
    
		// 整数の入力
        int[] list = new int[5];
        for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        String ans = "Yay!";
        for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        }
              
		// 出力
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] list = new int[5]; list new int[5] 5 for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
          list[i] = sc.nextInt();
        } {
          list[i] = sc.nextInt();
        } list[i] = sc.nextInt() list[i] list i sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc String ans = "Yay!"; ans "Yay!" for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        } {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        } int value = list[i]; value list[i] list i for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          } int index = i + 1; int index = i + 1; index i + 1 i 1 index < 5 index 5 index++ index++ index {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          } {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          } if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            } Math.abs(value - list[index]) > k Math.abs(value - list[index]) Math.abs Math value - list[index] value list[index] list index k {
              ans = ":(";
              break;
            } ans = ":(" ans ":(" break; System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
    
		// 整数の入力
        int[] list = new int[5];
        for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        String ans = "Yay!";
        for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        }
              
		// 出力
		System.out.println(ans);
	}
} public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
    
		// 整数の入力
        int[] list = new int[5];
        for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        String ans = "Yay!";
        for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        }
              
		// 出力
		System.out.println(ans);
	}
} Main
import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
    
		// 整数の入力
        int[] list = new int[5];
        for (int i = 0; i < 5; i++) {
          list[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        String ans = "Yay!";
        for (int i = 0; i < 5; i++) {
          int value = list[i];
          for (int index = i + 1; index < 5; index++) {
            if (Math.abs(value - list[index]) > k) {
              ans = ":(";
              break;
            }
          }
        }
              
		// 出力
		System.out.println(ans);
	}
}