fn main() {
    let n = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        line.trim().parse::<usize>().unwrap()
    };

    let ans = n - find_divisors(n).len();
    println!("{}", ans);
}

/// Creates a sequence consisting of the divisors of `n`.
pub fn find_divisors(n: usize) -> Vec<usize> {
    assert_ne!(n, 0, "`n` must be at least 1.");

    let mut divisors = vec![];

    for i in (1..).take_while(|i| i * i <= n) {
        if n % i == 0 {
            divisors.push(i);

            if n / i != i {
                divisors.push(n / i);
            }
        }
    }

    divisors.sort_unstable();

    divisors
}