import java.util.*;

public class Main{

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int[] dist =new int[5];
		for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		}
		int limit =sc.nextInt();

		if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
} import java.util.*; util.* java public class Main{

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int[] dist =new int[5];
		for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		}
		int limit =sc.nextInt();

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

		if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int[] dist =new int[5];
		for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		}
		int limit =sc.nextInt();

		if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] dist =new int[5]; dist new int[5] 5 for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		} int i=0; int i=0; i 0 i<5 i 5 i++ i++ i {
			dist[i]=sc.nextInt();
		} {
			dist[i]=sc.nextInt();
		} dist[i]=sc.nextInt() dist[i] dist i sc.nextInt() sc.nextInt sc int limit =sc.nextInt(); limit sc.nextInt() sc.nextInt sc if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		} dist[4]-dist[0] <= limit dist[4]-dist[0] dist[4] dist 4 dist[0] dist 0 limit {
			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 public class Main{

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int[] dist =new int[5];
		for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		}
		int limit =sc.nextInt();

		if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
} public class Main{

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int[] dist =new int[5];
		for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		}
		int limit =sc.nextInt();

		if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
} Main
import java.util.*;

public class Main{

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int[] dist =new int[5];
		for(int i=0;i<5;i++){
			dist[i]=sc.nextInt();
		}
		int limit =sc.nextInt();

		if(dist[4]-dist[0] <= limit){
			System.out.println("Yay!");
		}else{
			System.out.println(":(");
		}
	}
}