100！ 不知道对不对啊，反正查0的个数是对的

import java.math.BigInteger ;

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