UVa 10219 - Find the ways !

// UVa 10219 - Find the ways !

import java.math.BigInteger;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);
		while (scanner.hasNextBigInteger()) {
			BigInteger n = scanner.nextBigInteger();
			BigInteger k = scanner.nextBigInteger();
			BigInteger num = BigInteger.ONE;
			for (BigInteger i = n.subtract(k).add(BigInteger.ONE); i.compareTo(n) <= 0; i = i.add(BigInteger.ONE))
				num = num.multiply(i);
			BigInteger den = BigInteger.ONE;
			for (BigInteger i = BigInteger.ONE; i.compareTo(k) <= 0; i = i.add(BigInteger.ONE))
				den = den.multiply(i);
			System.out.println(num.divide(den).toString().length());
		}

	}

}