#include <iostream>
#include <cmath>
#include <iomanip>
#include <random>
#include <algorithm>

using namespace std;

int count(int n) {
    int count = -1, t_n = n, sum = 0;

    while (n != 0)
    {
        sum += n % 10;
        n /= 10;
    }
    while (t_n > 0)
    {
        count++;
        t_n -= sum;
    }

    return count;
}


int main() {
    int n;
    cin >> n;
    cout << "count = " << count(n);

    return 0;
}