#include <iostream>

using namespace std;

void prosta(int x1, int y1, int x2, int y2, int x3, int y3){

    int a, b;

    b = ((y1*x2)-(y2*x1)) / (x2-x1);
    a = (y2-y1)/(x2-x1);

    int logic = a*x3+b;

    if(logic == y3){
        cout<<"Lezy na prostej"<<endl;
    }
    else{
        cout<<" Nie lezy!";
    }

}

int main()
{
    int a[3];
    int b[3];
    for (int i=0; i<3; i++){
        cout<<"Podaj [x"<<i+1<<",y"<<i+1<<"]"<<endl;
        cin>>a[i];
        cin>>b[i];
    }

    prosta(a[0],b[0],a[1],b[1],a[2],b[2]);
}