import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{

    public static void main(String[] args) throws IOException{
        // write your code here

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int d = Integer.parseInt(reader.readLine());
        int e = Integer.parseInt(reader.readLine());
        int k = Integer.parseInt(reader.readLine());

        int cnt=0;

        if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++;

        if(d-c<=k && d-b<=k && d-a<=k)
            cnt++;

        if(c-b<=k && c-a<=k)
            cnt++;

        if(b-a<=k)
            cnt++;

        if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":(");

    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.IOException; IOException java.io public class Main{

    public static void main(String[] args) throws IOException{
        // write your code here

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int d = Integer.parseInt(reader.readLine());
        int e = Integer.parseInt(reader.readLine());
        int k = Integer.parseInt(reader.readLine());

        int cnt=0;

        if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++;

        if(d-c<=k && d-b<=k && d-a<=k)
            cnt++;

        if(c-b<=k && c-a<=k)
            cnt++;

        if(b-a<=k)
            cnt++;

        if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":(");

    }
} Main public static void main(String[] args) throws IOException{
        // write your code here

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int d = Integer.parseInt(reader.readLine());
        int e = Integer.parseInt(reader.readLine());
        int k = Integer.parseInt(reader.readLine());

        int cnt=0;

        if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++;

        if(d-c<=k && d-b<=k && d-a<=k)
            cnt++;

        if(c-b<=k && c-a<=k)
            cnt++;

        if(b-a<=k)
            cnt++;

        if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":(");

    } main {
        // write your code here

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int d = Integer.parseInt(reader.readLine());
        int e = Integer.parseInt(reader.readLine());
        int k = Integer.parseInt(reader.readLine());

        int cnt=0;

        if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++;

        if(d-c<=k && d-b<=k && d-a<=k)
            cnt++;

        if(c-b<=k && c-a<=k)
            cnt++;

        if(b-a<=k)
            cnt++;

        if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":(");

    } BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); reader new BufferedReader(new InputStreamReader(System.in)) int a = Integer.parseInt(reader.readLine()); a Integer.parseInt(reader.readLine()) Integer.parseInt Integer reader.readLine() reader.readLine reader int b = Integer.parseInt(reader.readLine()); b Integer.parseInt(reader.readLine()) Integer.parseInt Integer reader.readLine() reader.readLine reader int c = Integer.parseInt(reader.readLine()); c Integer.parseInt(reader.readLine()) Integer.parseInt Integer reader.readLine() reader.readLine reader int d = Integer.parseInt(reader.readLine()); d Integer.parseInt(reader.readLine()) Integer.parseInt Integer reader.readLine() reader.readLine reader int e = Integer.parseInt(reader.readLine()); e Integer.parseInt(reader.readLine()) Integer.parseInt Integer reader.readLine() reader.readLine reader int k = Integer.parseInt(reader.readLine()); k Integer.parseInt(reader.readLine()) Integer.parseInt Integer reader.readLine() reader.readLine reader int cnt=0; cnt 0 if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++; e-d<=k && e-c<=k && e-b<=k && e-a<=k e-b<=k e-d<=k && e-c<=k && e-b<=k && e-a<=k e-d<=k e-d e d k e-c<=k e-c e c k e-b<=k e-b e b k e-a<=k e-a e a k cnt++ cnt if(d-c<=k && d-b<=k && d-a<=k)
            cnt++; d-c<=k && d-b<=k && d-a<=k d-c<=k && d-b<=k && d-a<=k d-c<=k d-c d c k d-b<=k d-b d b k d-a<=k d-a d a k cnt++ cnt if(c-b<=k && c-a<=k)
            cnt++; c-b<=k && c-a<=k c-b<=k c-b c b k c-a<=k c-a c a k cnt++ cnt if(b-a<=k)
            cnt++; b-a<=k b-a b a k cnt++ cnt if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":("); cnt==4 cnt 4 System.out.println("Yay!") System.out.println System.out System System.out "Yay!" System.out.println(":(") System.out.println System.out System System.out ":(" String[] args args public class Main{

    public static void main(String[] args) throws IOException{
        // write your code here

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int d = Integer.parseInt(reader.readLine());
        int e = Integer.parseInt(reader.readLine());
        int k = Integer.parseInt(reader.readLine());

        int cnt=0;

        if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++;

        if(d-c<=k && d-b<=k && d-a<=k)
            cnt++;

        if(c-b<=k && c-a<=k)
            cnt++;

        if(b-a<=k)
            cnt++;

        if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":(");

    }
} public class Main{

    public static void main(String[] args) throws IOException{
        // write your code here

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int d = Integer.parseInt(reader.readLine());
        int e = Integer.parseInt(reader.readLine());
        int k = Integer.parseInt(reader.readLine());

        int cnt=0;

        if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++;

        if(d-c<=k && d-b<=k && d-a<=k)
            cnt++;

        if(c-b<=k && c-a<=k)
            cnt++;

        if(b-a<=k)
            cnt++;

        if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":(");

    }
} Main
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{

    public static void main(String[] args) throws IOException{
        // write your code here

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int d = Integer.parseInt(reader.readLine());
        int e = Integer.parseInt(reader.readLine());
        int k = Integer.parseInt(reader.readLine());

        int cnt=0;

        if(e-d<=k && e-c<=k && e-b<=k && e-a<=k)
            cnt++;

        if(d-c<=k && d-b<=k && d-a<=k)
            cnt++;

        if(c-b<=k && c-a<=k)
            cnt++;

        if(b-a<=k)
            cnt++;

        if(cnt==4)
            System.out.println("Yay!");
        else
            System.out.println(":(");

    }
}
