URAL 1083 Factorials!!!

f(n,k) = f(n - k,k) * n　　n > k

f(n,k) = n　　n <= k

 1 import java.util.Scanner;
 2
 3 public class P1083
 4 {
 5     public static int caculate(int n, int k)
 6     {
 7         if (n <= k)
 8             return n;
 9         return n * caculate(n - k, k);
10     }
11
12     public static void main(String args[])
13     {
14         try (Scanner cin = new Scanner(System.in))
15         {
16             while (cin.hasNext())
17             {
18                 int n = cin.nextInt();
19                 int k = cin.next().length();
20                 System.out.println(caculate(n, k));
21             }
22         }
23     }
24 }