ИТМО

#include <iostream>
#include <cmath>
#include <vector>
#include <queue>
#include <algorithm>
#include <string>
#include <stack>
#include <set>
#include <map>
#define pii pair <int,int>
#define vec vector
using namespace std;
using ll = long long;
using ld = long double;
using db = double;
void cv(vector <int> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvl(vector <ll> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}


void cvv(vector <vector <int> > &v){
    for (auto x: v) cv(x);
    cout<<"\n";
}

void cvb(vector <bool> v){
    for (bool x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvs(vector <string>  v){
    for (auto a: v){
        cout<<a<<"\n";
    }
}

void cvp(vector <pii> a){
    for (auto p: a){
        cout<<p.first<<' '<<p.second<<"\n";
    }
    cout<<"\n";
}

bool ok(string s, int til){
    int t = 0;
    for (char i: s) {
            t += i - '0';
            if (i == '0'){
                return 0;
            }
    }
    if (t > til){
        return 0;
    }
    return 1;
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int ans=5;
    vector <int> s = {2, 4, 6, 8, 10};
    for (int var: s){
        for (int i = 1; i <= 2 * pow(10, 10 - var); ++i){
            if (ok(to_string(i), 10 - var)){
                ans++;
            }
        }
    }
    cout<<ans;
}