import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int a, b, c, d, e, k;
            a = in.nextInt();
            b = in.nextInt();
            c = in.nextInt();
            d = in.nextInt();
            e = in.nextInt();
            k = in.nextInt();

            if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            }
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int a, b, c, d, e, k;
            a = in.nextInt();
            b = in.nextInt();
            c = in.nextInt();
            d = in.nextInt();
            e = in.nextInt();
            k = in.nextInt();

            if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            }
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) A solver = new A(); solver new A() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int a, b, c, d, e, k;
            a = in.nextInt();
            b = in.nextInt();
            c = in.nextInt();
            d = in.nextInt();
            e = in.nextInt();
            k = in.nextInt();

            if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            }
        }

    } A public void solve(int testNumber, Scanner in, PrintWriter out) {
            int a, b, c, d, e, k;
            a = in.nextInt();
            b = in.nextInt();
            c = in.nextInt();
            d = in.nextInt();
            e = in.nextInt();
            k = in.nextInt();

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

            if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            }
        } int a a b b c c d d e e k; k 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 k = in.nextInt() k in.nextInt() in.nextInt in if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            } e - a > k e - a e a k {
                out.println(":(");
            } out.println(":(") out.println out ":(" {
                out.println("Yay!");
            } out.println("Yay!") out.println out "Yay!" int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int a, b, c, d, e, k;
            a = in.nextInt();
            b = in.nextInt();
            c = in.nextInt();
            d = in.nextInt();
            e = in.nextInt();
            k = in.nextInt();

            if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            }
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int a, b, c, d, e, k;
            a = in.nextInt();
            b = in.nextInt();
            c = in.nextInt();
            d = in.nextInt();
            e = in.nextInt();
            k = in.nextInt();

            if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            }
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int a, b, c, d, e, k;
            a = in.nextInt();
            b = in.nextInt();
            c = in.nextInt();
            d = in.nextInt();
            e = in.nextInt();
            k = in.nextInt();

            if (e - a > k) {
                out.println(":(");
            } else {
                out.println("Yay!");
            }
        }

    }
}

