import java.util.*;

public class Main {
	public static void main(String[] args) {  
  		Scanner sc = new Scanner(System.in);
		int[] antena = new int[5];
      	
      	for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        }
      	int maxDis = sc.nextInt();
      	String res = "Yay!";
      	for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        }
      	System.out.println(res);
    }
} import java.util.*; util.* java public class Main {
	public static void main(String[] args) {  
  		Scanner sc = new Scanner(System.in);
		int[] antena = new int[5];
      	
      	for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        }
      	int maxDis = sc.nextInt();
      	String res = "Yay!";
      	for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        }
      	System.out.println(res);
    }
} Main public static void main(String[] args) {  
  		Scanner sc = new Scanner(System.in);
		int[] antena = new int[5];
      	
      	for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        }
      	int maxDis = sc.nextInt();
      	String res = "Yay!";
      	for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        }
      	System.out.println(res);
    } main {  
  		Scanner sc = new Scanner(System.in);
		int[] antena = new int[5];
      	
      	for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        }
      	int maxDis = sc.nextInt();
      	String res = "Yay!";
      	for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        }
      	System.out.println(res);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] antena = new int[5]; antena new int[5] 5 for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
        	antena[i] = sc.nextInt();
        } {
        	antena[i] = sc.nextInt();
        } antena[i] = sc.nextInt() antena[i] antena i sc.nextInt() sc.nextInt sc int maxDis = sc.nextInt(); maxDis sc.nextInt() sc.nextInt sc String res = "Yay!"; res "Yay!" for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        } int i = antena.length -1; int i = antena.length -1; i antena.length -1 antena.length antena antena.length 1 i >= 0 i 0 i-- i-- i {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        } {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        } for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            } int j = antena.length - 2; int j = antena.length - 2; j antena.length - 2 antena.length antena antena.length 2 j >= 0 j 0 j-- j-- j {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            } {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            } if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } antena[i] - antena[j] > maxDis antena[i] - antena[j] antena[i] antena i antena[j] antena j maxDis {
                 	res = ":(";
                 } res = ":(" res ":(" System.out.println(res) System.out.println System.out System System.out res String[] args args public class Main {
	public static void main(String[] args) {  
  		Scanner sc = new Scanner(System.in);
		int[] antena = new int[5];
      	
      	for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        }
      	int maxDis = sc.nextInt();
      	String res = "Yay!";
      	for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        }
      	System.out.println(res);
    }
} public class Main {
	public static void main(String[] args) {  
  		Scanner sc = new Scanner(System.in);
		int[] antena = new int[5];
      	
      	for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        }
      	int maxDis = sc.nextInt();
      	String res = "Yay!";
      	for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        }
      	System.out.println(res);
    }
} Main
import java.util.*;

public class Main {
	public static void main(String[] args) {  
  		Scanner sc = new Scanner(System.in);
		int[] antena = new int[5];
      	
      	for(int i = 0; i < 5; i++) {
        	antena[i] = sc.nextInt();
        }
      	int maxDis = sc.nextInt();
      	String res = "Yay!";
      	for(int i = antena.length -1; i >= 0; i--) {
        	for(int j = antena.length - 2; j >= 0; j--) {
            	 if(antena[i] - antena[j] > maxDis) {
                 	res = ":(";
                 } 
            }
        }
      	System.out.println(res);
    }
}