#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
using namespace std;
#define INIT cin.tie(0); ios::sync_with_stdio(false);
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)

int main()
{
    INIT;

    int A[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int cnt = 0;
    int a, b;
    REP(i, 12){
        FOR(j, 1, A[i] + 1){
            a = j / 10;
            b = j % 10;
            if(i + 1 == a + b) cnt++;
        }
    }
    cout << cnt << endl;



    return 0;
}