import java.util.*;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		
		Integer[] array = new Integer[5];
		for(int i = 0; i < 5; ++i) {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		}
		int k = Integer.parseInt(sc.next());
		
		
		
		
		
		if(array[4] - array[0] <= k) System.out.println("Yay!");
		else System.out.println(":(");
	}
} import java.util.*; util.* java class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		
		Integer[] array = new Integer[5];
		for(int i = 0; i < 5; ++i) {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		}
		int k = Integer.parseInt(sc.next());
		
		
		
		
		
		if(array[4] - array[0] <= k) System.out.println("Yay!");
		else System.out.println(":(");
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		
		Integer[] array = new Integer[5];
		for(int i = 0; i < 5; ++i) {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		}
		int k = Integer.parseInt(sc.next());
		
		
		
		
		
		if(array[4] - array[0] <= k) System.out.println("Yay!");
		else System.out.println(":(");
	} main {
		Scanner sc = new Scanner(System.in);
		
		
		Integer[] array = new Integer[5];
		for(int i = 0; i < 5; ++i) {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		}
		int k = Integer.parseInt(sc.next());
		
		
		
		
		
		if(array[4] - array[0] <= k) System.out.println("Yay!");
		else System.out.println(":(");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) Integer[] array = new Integer[5]; array new Integer[5] 5 for(int i = 0; i < 5; ++i) {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		} int i = 0; int i = 0; i 0 i < 5 i 5 ++i ++i i {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		} {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		} int tmp = sc.nextInt(); tmp sc.nextInt() sc.nextInt sc array[i] = tmp array[i] array i tmp int k = Integer.parseInt(sc.next()); k Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc if(array[4] - array[0] <= k) System.out.println("Yay!");
		else System.out.println(":("); array[4] - array[0] <= k array[4] - array[0] array[4] array 4 array[0] array 0 k System.out.println("Yay!") System.out.println System.out System System.out "Yay!" System.out.println(":(") System.out.println System.out System System.out ":(" String[] args args
import java.util.*;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		
		Integer[] array = new Integer[5];
		for(int i = 0; i < 5; ++i) {
		    int tmp = sc.nextInt();
		    array[i] = tmp;
		}
		int k = Integer.parseInt(sc.next());
		
		
		
		
		
		if(array[4] - array[0] <= k) System.out.println("Yay!");
		else System.out.println(":(");
	}
}