#include<iostream>
#include <stack>
using namespace std;
int factorialByStack(int num)
{
    stack<int> tmp;
    for(; num != 0; --num)
    {
        tmp.push(num);
    }
    int result = 1;
    while(!tmp.empty() )
    {
        result *= tmp.top();
        tmp.pop();
    }
    return result;
} 
int main()
{
int n = 3;
int result = 0;

result = factorialByStack(n);
cout<<result<<endl;
return 0;
}