#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        int ans = 0;
        int t[14] = { 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 <= t[i]; j++) {
                int x = 0;
                int d = j;
                while (d) {
                    x += d % 10;
                    d /= 10;
                }
                if (x == i)ans++;
            }
        }
        cout << ans << endl;
    }
    return 0;
}