#include <iostream>
#include <string>
#include <unordered_map>

using namespace std;
using ll = long long;

int main () {
    unordered_map<ll, bool> mp;
    string N; cin >> N;
    string x(N.size()+1, ' ');

    for (int i = 0; i <= N.size(); i++) {
        // 挿入場所
        int idx = 0;
        for (int j = 0; j <= N.size(); j++) {
            if (i == j) continue;
            x[j] = N[idx];
            idx++;
        }

        for (int j = 0; j <= 9; j++) {
            char c = (char) ('0' + j);
            x[i] = c;
            mp[stoll(x)] = true;
        }
    }

    mp[stoll(N)] = true;
    cout << mp.size() - 1 << "\n";

    return 0;
}