求100!

import java.math.*;

class Test
{
      public static void main (String []args)
      {     
             BigInteger big2 = new BigInteger("1");
             for (int i=1; i<=100; i++)
             {
                        BigInteger big1 = new BigInteger(String.valueOf(i));      
                        big2 = big2.multiply(big1); 
             }
          System.out.println(big2);
    }
}