hdu 1042 大数 N！

#include <iostream>
#include <cstring>
#include <cstdio>
using namespace std;

int f[40001];

int main(){
	
	int n;
	while( scanf( "%d",&n ) != EOF ){
		memset( f,sizeof( f ) );

		f[1] = 1;
		int len = 1;
		for( int i = 2; i <= n; i++ ){
			int yu = 0;
			int j = 1;
			for( ; j <= len; j++ ){
				int t = f[j] * i + yu;
				f[j] = t % 10;
				yu = t / 10;
			}
			while( yu ){
				f[j++] = yu % 10;
				yu /= 10;
			}
			len = j - 1;
		}

		for( int i = len; i >= 1; i-- ){
			cout << f[i];
		}
		cout << endl;
	}
	return 0;
}