/**
*    author:  boutarou
*    created: 02.08.2020 11:05:43
**/

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < int(n); i++)
using ll = long long;
using P = pair<int, int>;

int digit(int x) {
    int res = 0;
    while (x > 0) {
        res += x % 10;
        x /= 10;
    }
    return res;
}

int month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int main() {
    int cnt = 0;
    for (int i = 1; i <= 12; i++) {
        for (int j = 1; j <= month[i]; j++) {
            if (i == digit(j)) cnt++;
        }
    }
    cout << cnt << endl;
    return 0;
}