import java.util.*;
import java.io.*;

class Main {

	void solve () {

		int a = in.nextInt(), b = in.nextInt(), c = in.nextInt(), d = in.nextInt(), e = in.nextInt();
		int k = in.nextInt();
		
		out.println(e-a<=k ? "Yay!" : ":(");
		
		
	}
	
	public static Scanner in = new Scanner(System.in);
	public static PrintWriter out = new PrintWriter(System.out);
	public static void main(String[] args) {
		new Main().solve();
		out.flush();
	}

} import java.util.*; util.* java import java.io.*; io.* java class Main {

	void solve () {

		int a = in.nextInt(), b = in.nextInt(), c = in.nextInt(), d = in.nextInt(), e = in.nextInt();
		int k = in.nextInt();
		
		out.println(e-a<=k ? "Yay!" : ":(");
		
		
	}
	
	public static Scanner in = new Scanner(System.in);
	public static PrintWriter out = new PrintWriter(System.out);
	public static void main(String[] args) {
		new Main().solve();
		out.flush();
	}

} Main public static Scanner in = new Scanner(System.in); in new Scanner(System.in) public static PrintWriter out = new PrintWriter(System.out); out new PrintWriter(System.out) void solve () {

		int a = in.nextInt(), b = in.nextInt(), c = in.nextInt(), d = in.nextInt(), e = in.nextInt();
		int k = in.nextInt();
		
		out.println(e-a<=k ? "Yay!" : ":(");
		
		
	} solve {

		int a = in.nextInt(), b = in.nextInt(), c = in.nextInt(), d = in.nextInt(), e = in.nextInt();
		int k = in.nextInt();
		
		out.println(e-a<=k ? "Yay!" : ":(");
		
		
	} int a = in.nextInt() a in.nextInt() in.nextInt in b = in.nextInt() b in.nextInt() in.nextInt in c = in.nextInt() c in.nextInt() in.nextInt in d = in.nextInt() d in.nextInt() in.nextInt in e = in.nextInt(); e in.nextInt() in.nextInt in int k = in.nextInt(); k in.nextInt() in.nextInt in out.println(e-a<=k ? "Yay!" : ":(") out.println out e-a<=k ? "Yay!" : ":(" e-a<=k e-a e a k "Yay!" ":(" public static void main(String[] args) {
		new Main().solve();
		out.flush();
	} main {
		new Main().solve();
		out.flush();
	} new Main().solve() new Main().solve new Main() out.flush() out.flush out String[] args args
import java.util.*;
import java.io.*;

class Main {

	void solve () {

		int a = in.nextInt(), b = in.nextInt(), c = in.nextInt(), d = in.nextInt(), e = in.nextInt();
		int k = in.nextInt();
		
		out.println(e-a<=k ? "Yay!" : ":(");
		
		
	}
	
	public static Scanner in = new Scanner(System.in);
	public static PrintWriter out = new PrintWriter(System.out);
	public static void main(String[] args) {
		new Main().solve();
		out.flush();
	}

}