правка

import java.util.Scanner;
public class Main
{
    public static void main(String[]args)
    {
        int numM;
        int numK;
        int num;
        boolean isCorrect;
        numM = 0;
        num = 4;
        numK = 0;
        Scanner scan = new Scanner(System.in);
        System.out.print("Given an integer m > 10. Find the largest integer k for which 4^k < m.\n");
        System.out.print("Enter an integer (>10): ");
        do
        {
            isCorrect = true;
            try {
                numM = Integer.parseInt(scan.next());
            }
            catch (NumberFormatException e) {
                System.out.print("Incorrect value. Enter the number: ");
                isCorrect = false;
            }
            if ((!isCorrect) && (numM < 10))
            {
                System.out.print("Incorrect value. Enter the number: ");
                isCorrect = false;
            }
        } while (isCorrect);
        scan.close();
        while (num < numM) {
            num = num * 4;
            numK++;
        }
        System.out.print(numK);
    }
}