program water;
var
 konec:boolean;
 x,y,s:real;
begin
repeat
 read(x);
 read(y);
 if x=0 then if y=0 then konec:=true;
 if not konec then 
 begin
  s:=3.1415926*(sqr(x)+sqr(y))/2;
  if s<50 then s:=50;
  writeln('The property will be flooded in hour ',s/50:1:0,'.');
 end;
until konec;
end.