import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        };
        int dist = sc.nextInt();
        boolean res = true;
        for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        }
        
        System.out.println(res ? "Yay!" : ":(");
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        };
        int dist = sc.nextInt();
        boolean res = true;
        for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        }
        
        System.out.println(res ? "Yay!" : ":(");
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        };
        int dist = sc.nextInt();
        boolean res = true;
        for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        }
        
        System.out.println(res ? "Yay!" : ":(");
    } main {
        Scanner sc = new Scanner(System.in);
        int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        };
        int dist = sc.nextInt();
        boolean res = true;
        for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        }
        
        System.out.println(res ? "Yay!" : ":(");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        }; antenas {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        } sc.nextInt() sc.nextInt sc sc.nextInt() sc.nextInt sc sc.nextInt() sc.nextInt sc sc.nextInt() sc.nextInt sc sc.nextInt() sc.nextInt sc int dist = sc.nextInt(); dist sc.nextInt() sc.nextInt sc boolean res = true; res true for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        } int i = 0; int i = 0; i 0 i < antenas.length - 1 i antenas.length - 1 antenas.length antenas antenas.length 1 i++ i++ i {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        } {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        } for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            } int j = i; int j = i; j i j + i < antenas.length - 1 j + i j i antenas.length - 1 antenas.length antenas antenas.length 1 j++ j++ j {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            } {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            } if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                } antenas[j+1] - antenas[i] > dist antenas[j+1] - antenas[i] antenas[j+1] antenas j+1 j 1 antenas[i] antenas i dist {
                    res = false;
                    break;
                } res = false res false break; if (!res) break; !res res break; System.out.println(res ? "Yay!" : ":(") System.out.println System.out System System.out res ? "Yay!" : ":(" res "Yay!" ":(" String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        };
        int dist = sc.nextInt();
        boolean res = true;
        for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        }
        
        System.out.println(res ? "Yay!" : ":(");
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        };
        int dist = sc.nextInt();
        boolean res = true;
        for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        }
        
        System.out.println(res ? "Yay!" : ":(");
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int[] antenas = {
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt(),
            sc.nextInt()
        };
        int dist = sc.nextInt();
        boolean res = true;
        for (int i = 0;i < antenas.length - 1;i++) {
            for (int j = i; j + i < antenas.length - 1; j++) {
                if (antenas[j+1] - antenas[i] > dist) {
                    res = false;
                    break;
                }
            }
            if (!res) break;
        }
        
        System.out.println(res ? "Yay!" : ":(");
    }
}
