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

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
   	Scanner sc = new Scanner(System.in);

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 }
} Main public static void main(String[] args){
   	Scanner sc = new Scanner(System.in);

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 } main {
   	Scanner sc = new Scanner(System.in);

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int Na = sc.nextInt(); Na sc.nextInt() sc.nextInt sc int Nb = sc.nextInt(); Nb sc.nextInt() sc.nextInt sc int Nc = sc.nextInt(); Nc sc.nextInt() sc.nextInt sc int Nd = sc.nextInt(); Nd sc.nextInt() sc.nextInt sc int Ne = sc.nextInt(); Ne sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":("); Ne-Na<=k Ne-Na Ne Na k 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){
   	Scanner sc = new Scanner(System.in);

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 }
} public class Main{
  public static void main(String[] args){
   	Scanner sc = new Scanner(System.in);

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 }
} Main
import java.util.*;
public class Main{
  public static void main(String[] args){
   	Scanner sc = new Scanner(System.in);

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 }
}