#include <bits/stdc++.h>
using namespace std;

int calc(int j){
    int n = 0;
    while (j != 0){
        n += (j % 10);
        j /= 10;
    }
    return n;
}

int main()
{
    int ans = 0;
    int days[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    for (int i = 1; i <= 12; ++i){
        for (int j = 1; j <= days[i]; ++j){
            if (calc(j) == i) ++ans;
        }
    }

    cout << ans << endl;
    return 0;
}