using System;
using System.Linq;
using System.Numerics;
public static class Factorial
{
public static void Main(string[] args)
{
int num = 100;
Console.WriteLine(Enumerable.Range(1, num).Select(i => new BigInteger(i)).Aggregate((a, b) => a * b));
}
}
// 93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000