小 Frane 已经上十年级了，但依然在微机课上为 Pascal 语言发愁。作为家庭作业，他的老师在他的笔记本上写下了以下程序，他需要根据给定的整数 $N$ 确定程序的输出。
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);请编写一个程序来解决 Frane 的问题。
输入的第一行包含整数 $N$ ($1 \le N \le 10^9$)。
在单行中输出结果。
1
0
10
5
27
18
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