UVA - 10219 - Find the ways !

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        String m="";
        while((m=br.readLine())!=null) {
            String[]str=m.split(" ");
            int x=Integer.parseInt(str[0]);
            int y=Integer.parseInt(str[1]);
            sb.append(c(x,y)).append("\n");
        }
        System.out.print(sb);
    }
   
    static int c(int n, int r) {
        BigInteger ans = BigInteger.ONE;
        r = Math.min(r, n - r);
        for (int i = 1; i < r + 1; i++) {
            ans = ans.multiply(BigInteger.valueOf(n - r + i));
            ans =ans.divide(BigInteger.valueOf(i));
        }
        return (ans+"").length();
    }
   
}