import java.util.Scanner;

public class Main{
	static public void  main(String[] args){
		Scanner scan = new Scanner(System.in);
		int[] p = new int[5];
		for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		}
		int k = scan.nextInt();
		String ret = "Yay!";
		for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
}
		System.out.println(ret);
	}
} import java.util.Scanner; Scanner java.util public class Main{
	static public void  main(String[] args){
		Scanner scan = new Scanner(System.in);
		int[] p = new int[5];
		for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		}
		int k = scan.nextInt();
		String ret = "Yay!";
		for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
}
		System.out.println(ret);
	}
} Main static public void  main(String[] args){
		Scanner scan = new Scanner(System.in);
		int[] p = new int[5];
		for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		}
		int k = scan.nextInt();
		String ret = "Yay!";
		for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
}
		System.out.println(ret);
	} main {
		Scanner scan = new Scanner(System.in);
		int[] p = new int[5];
		for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		}
		int k = scan.nextInt();
		String ret = "Yay!";
		for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
}
		System.out.println(ret);
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int[] p = new int[5]; p new int[5] 5 for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		} int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
			p[i] = scan.nextInt();
		} {
			p[i] = scan.nextInt();
		} p[i] = scan.nextInt() p[i] p i scan.nextInt() scan.nextInt scan int k = scan.nextInt(); k scan.nextInt() scan.nextInt scan String ret = "Yay!"; ret "Yay!" for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
} int i = 0; int i = 0; i 0 i < 4 i 4 i++ i++ i {
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
} {
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
} for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			} int j = i+1; int j = i+1; j i+1 i 1 j < 5 j 5 j++ j++ j {
				if(p[j] - p[i] > k) ret=":(";
			} {
				if(p[j] - p[i] > k) ret=":(";
			} if(p[j] - p[i] > k) ret=":("; p[j] - p[i] > k p[j] - p[i] p[j] p j p[i] p i k ret=":(" ret ":(" System.out.println(ret) System.out.println System.out System System.out ret String[] args args public class Main{
	static public void  main(String[] args){
		Scanner scan = new Scanner(System.in);
		int[] p = new int[5];
		for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		}
		int k = scan.nextInt();
		String ret = "Yay!";
		for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
}
		System.out.println(ret);
	}
} public class Main{
	static public void  main(String[] args){
		Scanner scan = new Scanner(System.in);
		int[] p = new int[5];
		for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		}
		int k = scan.nextInt();
		String ret = "Yay!";
		for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
}
		System.out.println(ret);
	}
} Main
import java.util.Scanner;

public class Main{
	static public void  main(String[] args){
		Scanner scan = new Scanner(System.in);
		int[] p = new int[5];
		for(int i = 0; i < 5; i++){
			p[i] = scan.nextInt();
		}
		int k = scan.nextInt();
		String ret = "Yay!";
		for(int i = 0; i < 4; i++){
			for(int j = i+1; j < 5; j++){
				if(p[j] - p[i] > k) ret=":(";
			}
}
		System.out.println(ret);
	}
}
