#include <iostream>
using namespace std;
int giaiThua(int n)
{
    if (n == 1)
        return 1;
    return n * giaiThua(n - 1);
}
int main()
{
    int n,m,y;
    cout << "Nhap n: ";
    cin >> n;
    cout << "\nGiai thua " << n << " la: " << giaiThua(n);
    cout << "\nNhap m: ";
    cin >> m;
    cout << "\nNhap y: ";
    cin >> y;
    cout << "\nGiai thua (m+y) la: " << giaiThua(m+y);
    return 0;
}