import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        System.out.println(ans);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        System.out.println(ans);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        System.out.println(ans);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] a = new int[5]; a new int[5] 5 for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        } int i=0; int i=0; i 0 i<5 i 5 i++ i++ i {
            a[i] = Integer.parseInt(sc.next());
        } {
            a[i] = Integer.parseInt(sc.next());
        } a[i] = Integer.parseInt(sc.next()) a[i] a i Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int k = Integer.parseInt(sc.next()); k Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc String ans = "Yay!"; ans "Yay!" for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        } int i=0; int i=0; i 0 i<4 i 4 i++ i++ i {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        } {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        } for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            } int j=i+1; int j=i+1; j i+1 i 1 j<5 j 5 j++ j++ j {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            } {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            } if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                } a[j]-a[i] > k a[j]-a[i] a[j] a j a[i] a i k {
                    ans = ":(";
                    break;
                } ans = ":(" ans ":(" break; System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        System.out.println(ans);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        System.out.println(ans);
    }
} Main
import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        System.out.println(ans);
    }
}