program z16_7;
uses crt;
var x,y:longint;
BEGIN
clrscr;
write('vvedite koordinaty');
readln(x,y);
if ((x*x+y*y>=4) and (x*x+y*y<=16) and
(x<=0) and (y>=0)) or
((x*x+y*y>=4) and (x>=0) and (y>=0))
then writeln('ok')
else writeln('ploxo');
readln;
END.