var

i, n, a, b, x, y, xp, yp : integer;

f, g : Text;

p : boolean;

function SaIsteStrane(x1, y1, x2, y2, a, b : real) : boolean;

begin

SaIsteStrane := (y1-a*x1-b)*(y2-a*x2-b) >= 0;

end;

begin

Assign(f,'Tacke.in'); Assign(g,'Tacke.out');

Reset(f); Rewrite(g);

ReadLn(f,n,a,b);

ReadLn(f,xp,yp);

i := 2; p := True;

While (i <= n) and p do

begin

ReadLn(f,x,y);

if not SaIsteStrane(x,y,xp,yp,a,b) then p := False;

i := i + 1;

end;

if p then WriteLn(g,'Sve tacke su sa iste strane date prave.')

else WriteLn(g,'Nisu sve tacke sa iste strane date prave.');

Close(f); Close(g);

end.