#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

int main() {
    
    int cnt = 0;
    int val1, val2;
    for (int i=1; i<=12; ++i) {
        switch (i) {
        case 1: case 3: case 5: case 7: case 8: case 10: case 12:
            for (int j=1; j<=31; ++j) {
                val1 = j / 10;
                val2 = j % 10;
                if (i == val1 + val2) ++cnt;
            }
            break;
        case 4: case 6: case 9: case 11:
            for (int j=1; j<=30; ++j) {
                val1 = j / 10;
                val2 = j % 10;
                if (i == val1 + val2) ++cnt;
            }
            break;
        case 2:
            for (int j=1; j<=28; ++j) {
                 val1 = j / 10;
                val2 = j % 10;
                if (i == val1 + val2) ++cnt;
            }
            break;
        }
    }
    cout << cnt << endl;
    return 0;
}