#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <fstream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

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

int main() {
	int cnt = 0;
	for (int m = 1; m <= 12; m++)
		for (int d = 1; d <= a[m - 1]; d++) {
			if (d / 10 + d % 10 == m)
				cnt++;
		}
	cout << cnt << endl;
}