Julya Calendar

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long int
#define ld long double
#define pb push_back
#define p_b pop_back
#define si stack<int>
#define sll stack<ll>
#define sc stack<char>
#define vi vector<int>
#define vll vector<ll>
#define mii map<int, int>
#define msi map<string, int>
#define mci map<char, int>
#define qc queue<char>
#define qi queue<int>
#define qll queue<ll>
using namespace std;

ull power(int n, int b){
    if(b == 0){
        return 1;
    } else{
        if(b%2 == 0){
            return power(n, b/2)*power(n, b/2);
        } else{
            return n*power(n, (b-1)/2)*power(n, (b-1)/2);
        }
    }
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ull n, m, count = 0;
    cin >> n;
    while(n > 0){
        int dp[10] = {0}, digits = 1;
        m = n;
        while(m > 0){
            dp[m%10] = digits;
            m /= 10;
            digits++;
        }
        for(int i = 9; i >= 0; i--){
            if(dp[i] > 0){
                if(i == 9){
                    n -= 9*power(10, dp[i]-1);
                    count += power(10, dp[i]-1);
                } else if(i > 0){
                    n -= i;
                    count++;
                }

                break;
            }
        }
    }
    cout << count << "\n";
    return 0;
}