#include <iostream>
#include <string>
#include <set>

using namespace std;

set <string> toate;

int main()
{
    ios_base::sync_with_stdio(false);

    char x;
    cin >> x;
    cin >> x;

    string sir;
    cin >> sir;

    string nou;

    for (int i = 0; i <= sir.size(); i++) {
        for (int j = 0; j < 10; j++) {
            nou = sir;
            nou.insert(i, 1, '0' + j);
            toate.insert(nou);
        }
    }

    cout << toate.size() << '\n';
    return 0;
}