#include <iostream>
using namespace std;
 
struct Punkt {
    double x;
    double y;
};
 
void czytaj_punkt(Punkt &p, double x, double y) {
    p.x = x;
    p.y = y;
}
 
double det(Punkt A, Punkt B, Punkt P) {
    return (B.x - A.x) * (P.y - A.y) - (B.y - A.y) * (P.x - A.x);
}
 
bool punkt_po_stronie(Punkt A, Punkt B, Punkt P) {
    return det(A,B,P) < 0;
}
 
int main() {
    Punkt A, B, P;
 
    czytaj_punkt(A, 1, 1);
    czytaj_punkt(B, 3, 3);
    czytaj_punkt(P, 0, 1);
 
    if(det(A,B,P) < 0)
        cout << "Punkt P lezy po lewej stronie";
    else
        cout << "Punkt P lezy po prawej stronie";
 
    return 0;
}

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