#include <iostream>
#include <math.h>
#include <windows.h>
using namespace std;
main()
{

	int a, b, c;

	double p,S;


		cout<< "Witaj! Ten program oblicza pole dowolnego trojkata" << endl;
		cout << "Podaj bok a" << endl;
		cin>> a;
		system("cls");
		cout <<"Podaj bok b" << endl;
		cin>> b;
		system("cls");
		cout << "Podaj bok c" << endl;
		cin >> c;
		system("cls");


		if((a+b>c)&&(a+c>b)&&(b+c>a))
		{
			p=(a+b+c)/2;
			S=sqrt(p*(p-a)*(p-b)*(p-c));
			cout << "Pole trojkata wynosi: " <<S<<endl;

		}

		else
		{
			cout << "Taki trojkat nie istnieje ;p" << endl;
		}










	return 0;

}