Java Fibonacci Exercise

package fibonacci;

import java.util.Scanner;

/**
 *
 * @author Aidan
 */
public class Fibonacci {

    static {
        renew();
    }

    private static void renew() {
        input = new Scanner(System.in);
    }

    private static Scanner input;

    public static void main(String[] args) {
        Integer a = 0, b = 1, c = 0, upper;

        do {
            System.out.print("Enter the number to approch: ");
            try {
                upper = input.nextInt();
            } catch (Exception e) {
                upper = 0;
            }
            renew();
        } while (upper <= 0);

        do {
            c = a + b;
            a = b;
            b = c;
            //
            System.out.print(a + " ");
            System.out.flush();
        } while (c < upper);

        System.out.println("\nReached " + a + '.');
        System.out.flush();

    }

}