lab1_3

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    int n, i;
    double result = 1;
    cout << "Vvedite n: ";
    cin >> n;
    if (n % 2 == 0)
        i = 2;
    else
        i = 1;
    while (i <= n)
    {
          result *= i;
          i += 2;
    }
    cout << "Resultal: " << result << endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}