SCOI2009生日快乐

竟然是搜索……囧

还以为是什么神题……

uses math;
var x,y:extended;
    n:longint;
function find(x,y:extended;z:longint):extended;
  var i:longint;
      r1,r2:extended;
  begin
  find:=10000000;
  if z=1 then
   begin
   if x>y then exit(x/y) else exit(y/x);
   end;
  for i:=1 to z-1 do
   begin
   r1:=find(x*i/z,y,i);r2:=find(x*(z-i)/z,y,z-i);
   find:=min(find,max(r1,r2));
   end;
  for i:=1 to z-1 do
   begin
   r1:=find(x,y*i/z,i);r2:=find(x,y*(z-i)/z,z-i);
   find:=min(find,max(r1,r2));
   end;
  end;
begin
 readln(x,y,n);
 writeln(find(x,y,n):0:6);
end.