Poj Solution 2661

http://poj.org/problem?id=2661

//* @author: 82638882@163.com
import java.util.*;
public class Main
{
 public static void main(String[] args)
 {
  Scanner in=new Scanner(System.in);
  while(true)
  {
    int a=in.nextInt();
    if(a==0) break;
    a-=1960;
    a/=10;
    a=(int)Math.pow(2, a+2);
    double k=0;
    int n=2;
    while(k< a)
    {
          k+=Math.log(n)/Math.log(2);
      n++;
    }
    System.out.println(n-2);
   }
 }
}