#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <cmath>
#include <algorithm>
#include <functional>
#include <stack>
#include <numeric>
typedef long long ll;
using namespace std;
const int MOD = (int)1e9 + 7;
const ll INF = (ll)1e18 + 7;
#define int long long
#define vint vector<int>
#define pint pair<int,int>
#define pb(a) push_back(a)
#define all(v) v.begin(),v.end()
#define dbg(x) cerr << #x << " = " << (x) << endl
#define yn(b) cout << ((b) ? "Yes" : "No") << endl
#define YN(b) cout << ((b) ? "YES" : "NO") << endl

int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};

int calender[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

//各位の和を返す
int GetDigitSum(int num){
	int N = 0;
	while (num > 0){
		N += num % 10;
		num /= 10;
	}
	return N;
}

signed main()
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	int ans = 0;

	for (int i = 0; i < 12; i++) {
		for (int j = 1; j <= calender[j]; j++) {
			if(i+1==GetDigitSum(j)){
				ans++;
			}
		}
	}

	cout << ans << endl;

	return 0;
}