#include <iostream>
#include <string>
using namespace std;
int main() {
    int m, j, s, count=0;
    for (m=1; m<=12; m++) {
        for (j=0; j<=m; j++) {
            s = m - j;
            if (s >= 10) continue;
            if (m == 2) {
                if (j * 10 + s > 28) break;
            } else if (m == 4 || m == 6 || m == 9 || m == 11) {
                if (j * 10 + s > 30) break;
            } else {
                if (j * 10 + s > 31) break;
            }
            count++;
        }
    }
    cout << count << endl;
    return 0;
}