#0002A5

Pascal

Little Frane is already in tenth grade, but is still struggling with Pascal in computer class. For homework, his teacher wrote the following program into his notebook, and he needs to determine the output, given the integer N.
readln(N);
counter := 0;
for i := N-1 downto 1 do begin
counter := counter + 1;
if N mod i = 0 then break;
end;
writeln(counter);
Write a program which solves Frane's problem.


InputThe first line of input contains the integer N (1 ≤ N109).

OutputOutput the result on a single line.


Input

1


Output

0

Input
10
Output
5

Input
27
Output
18

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