import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int[] a = new int[5];
		
		boolean ch = true;


		for(int i=0;i<5;i++) {
			a[i] = sc.nextInt();
		}
		
		int k = sc.nextInt();

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

		int[] a = new int[5];
		
		boolean ch = true;


		for(int i=0;i<5;i++) {
			a[i] = sc.nextInt();
		}
		
		int k = sc.nextInt();

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

		int[] a = new int[5];
		
		boolean ch = true;


		for(int i=0;i<5;i++) {
			a[i] = sc.nextInt();
		}
		
		int k = sc.nextInt();

		out: for(int i=0; i<4;i++) {
			for(int j=i+1;j<5;j++) {
				if(a[j]-a[i]<=k ) ch=true;
				else {
					ch=false;
					break out;
				}
			}
		}
		if(ch==true)System.out.print("Yay!");
		else System.out.print(":(");
	} main {
		Scanner sc = new Scanner(System.in);

		int[] a = new int[5];
		
		boolean ch = true;


		for(int i=0;i<5;i++) {
			a[i] = sc.nextInt();
		}
		
		int k = sc.nextInt();

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

		int[] a = new int[5];
		
		boolean ch = true;


		for(int i=0;i<5;i++) {
			a[i] = sc.nextInt();
		}
		
		int k = sc.nextInt();

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

		int[] a = new int[5];
		
		boolean ch = true;


		for(int i=0;i<5;i++) {
			a[i] = sc.nextInt();
		}
		
		int k = sc.nextInt();

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

		int[] a = new int[5];
		
		boolean ch = true;


		for(int i=0;i<5;i++) {
			a[i] = sc.nextInt();
		}
		
		int k = sc.nextInt();

		out: for(int i=0; i<4;i++) {
			for(int j=i+1;j<5;j++) {
				if(a[j]-a[i]<=k ) ch=true;
				else {
					ch=false;
					break out;
				}
			}
		}
		if(ch==true)System.out.print("Yay!");
		else System.out.print(":(");
	}
}
