Uses crt;
Var n,i: longint;
s: extended;
Function GiaiThua(n : integer) : int64;
Begin
Giaithua:=1;
For i:=2 to n do
Giaithua:=Giaithua*i;
End;
Begin
Clrscr;
Write('Nhap n: '); Readln(n);
s:=0;
For i:=1 to n do
s:=s+i/Giaithua(i);
Write(S:5:2);
Readln
End.