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import java.util.Scanner;

public class FactorialCalculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a non-negative integer: ");
        int n = scanner.nextInt();
        scanner.close();

        long factorial = calculateFactorial(n);
        System.out.println(n + "! = " + factorial);
    }

    static long calculateFactorial(int n) {
        if (n < 0) {
            throw new IllegalArgumentException("Input must be a non-negative integer.");
        }

        long factorial = 1;
        for (int i = 2; i <= n; i++) {
            factorial *= i;
        }
        return factorial;
    }
}

import java.util.Scanner;

public class StringReversal {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a string: ");
        String input = scanner.nextLine();
        scanner.close();

        String reversed = reverseString(input);
        System.out.println("Reversed string: " + reversed);
    }

    static String reverseString(String str) {
        StringBuilder reversed = new StringBuilder();
        for (int i = str.length() - 1; i >= 0; i--) {
            reversed.append(str.charAt(i));
        }
        return reversed.toString();
    }
}

import java.util.Scanner;

public class MaxOfThreeNumbers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter three numbers:");
        double num1 = scanner.nextDouble();
        double num2 = scanner.nextDouble();
        double num3 = scanner.nextDouble();
        scanner.close();

        double max = findMax(num1, num2, num3);
        System.out.println("Maximum of the three numbers is: " + max);
    }

    static double findMax(double a, double b, double c) {
        double max = a;
        if (b > max) {
            max = b;
        }
        if (c > max) {
            max = c;
        }
        return max;
    }
}