#include <iostream>
using namespace std;

int main() {

    cout << "Enter a positive number: ";
    int number;
    cin >> number;

    if (number < 0)
        cout << "Error! Number is not positive";
    else {
        int factorial = 1;
        for (int i = 1; i<=number; i++)
             factorial = factorial * i;  // factorial *= i
        cout << "The factorial of " << number << ": " << factorial;
    }


    return 0;
}