#include <iostream>
#include <map>

using namespace std;

int main(int argc, char const* argv[]) {
    map<int, int> m;

    m[1]  = 31;
    m[2]  = 28;
    m[3]  = 31;
    m[4]  = 30;
    m[5]  = 31;
    m[6]  = 30;
    m[7]  = 31;
    m[8]  = 31;
    m[9]  = 30;
    m[10] = 31;
    m[11] = 30;
    m[12] = 31;

    int count = 0;

    for (int i = 1; i < 13; i++) {
        for (int j = 1; j < m[i]+1; j++) {
            if (i == j % 10 + j % 100 / 10) {
                count++;
            }
        }
    }

    cout << count << endl;
    return 0;
}