program jc(input,output);
var
  a,b:integer;
function jiecheng(x:integer):integer;
  var i,y:integer;
  begin
    if (x=0) or (x=1)
      then y:=1
      else
        begin
          y:=_______
          for i:=________ to __________ do
          _______________
        end;
        ______________
  end;
begin
  readln(a);
  b:=jiecheng(a);
  writeln(b);
end.