#include <iostream>
using namespace std;


double siperfaqja(double baza, double lartesia);

 int main() 
{
    double b, h, S;
    
    cout << "Jep bazen e trekendeshit: ";
    cin >> b;
    
    cout << "Jep lartesine e trekendeshit: ";
    cin >> h;
    
    S = siperfaqja(b, h) ;
    
    cout << "Siperfaqja e trekendeshit eshte: "<< S << endl;
    
	return 0;
}


double siperfaqja(double baza, double lartesia)
{
	 return (baza * lartesia) / 2;
}