#include <iostream>

using namespace std;

int main() {
    double a, h;
    cout <<"Ââåäèòå îñíîâàíèå:\n";
    cin >>a;
    cout <<"Ââåäèòå âûñîòó:\n";
    cin >>h;
    cout <<"Ïëîùàäü òðåóãîëüíèêà: "<<(a*h)/2<<endl;
    system ("pause");
    return 0;
}