#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <fstream>
#include <set>
#include <utility>
#include <algorithm>

#define rep(i,p,n) for(int i=p;i<n;i++)
#define lli long long int
#define vi vector<int> 
#define max(x,y) (x>y)?x:y
#define min(x,y) (x<y)?x:y

using namespace std;

int main() {
	int day[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
	int count = 0;

	for (int i = 1; i < 12; i++) {
		for (int j = 1; j <= day[i - 1]; j++) {
			if (i == j % 10 + (j / 10) % 10) count++;
		}
	}

	cout << count << endl;

	return 0;
}