zad19

#include <iostream>

using namespace std;

int pole_trojkata (int a, int b)
{
    int p;
    p=a*b/2;
    return p;
}

int main()
{
    cout<< pole_trojkata(2,3) <<endl;
    cout<< pole_trojkata(5,10) <<endl;
    cout<< pole_trojkata(6,3) <<endl;
    return 0;
}