program Project2;
{$APPTYPE CONSOLE}
uses
  SysUtils;


var
  n, k, h, w, i:integer;
  l, r : int64;

 function ok(x : int64) : boolean;
   begin
    if (x div h)*(x div w)>=n then result:=true
        else result:=false;
    end;

begin
reset(input, 'diploms.in');
 rewrite(output, 'diploms.out');
    read(w, h, n);

   l:=1;
   r:=10000000;
   while  r - l > 1 do begin
       if ok((r+l) div 2) then r:=(r+l) div 2
          else l:=(r+l) div 2;

   end;
   writeln(r);
   readln;
   readln;
end.