import java.util.Scanner;

class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int antena[] = new int[5];
		for(int i = 0; i < 5; i++){
			antena[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		boolean a = false;
		out : for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if((antena[i] - antena[j] > k) || (antena[i] - antena[j] < -k)){
					a = true;
					break out;
				}
			}
		}
		if(!a){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
} import java.util.Scanner; Scanner java.util class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int antena[] = new int[5];
		for(int i = 0; i < 5; i++){
			antena[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		boolean a = false;
		out : for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if((antena[i] - antena[j] > k) || (antena[i] - antena[j] < -k)){
					a = true;
					break out;
				}
			}
		}
		if(!a){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
} Main public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int antena[] = new int[5];
		for(int i = 0; i < 5; i++){
			antena[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		boolean a = false;
		out : for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if((antena[i] - antena[j] > k) || (antena[i] - antena[j] < -k)){
					a = true;
					break out;
				}
			}
		}
		if(!a){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int antena[] = new int[5];
		for(int i = 0; i < 5; i++){
			antena[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		boolean a = false;
		out : for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if((antena[i] - antena[j] > k) || (antena[i] - antena[j] < -k)){
					a = true;
					break out;
				}
			}
		}
		if(!a){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int antena[] = new int[5]; antena new int[5] 5 for(int i = 0; i < 5; i++){
			antena[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			antena[i] = sc.nextInt();
		} {
			antena[i] = sc.nextInt();
		} antena[i] = sc.nextInt() antena[i] antena i sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc boolean a = false; a false if(!a){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		} !a a {
			System.out.println("Yay!");
		} System.out.println("Yay!") System.out.println System.out System System.out "Yay!" {
			System.out.println(":(");
		} System.out.println(":(") System.out.println System.out System System.out ":(" String args[] args
import java.util.Scanner;

class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int antena[] = new int[5];
		for(int i = 0; i < 5; i++){
			antena[i] = sc.nextInt();
		}
		int k = sc.nextInt();
		boolean a = false;
		out : for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if((antena[i] - antena[j] > k) || (antena[i] - antena[j] < -k)){
					a = true;
					break out;
				}
			}
		}
		if(!a){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
}