#include <iostream>

constexpr int count() {
    int month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    int counter=0;
    for(int i=1; i<=12; ++i) {
        for(int d=1; d<=month[i]; ++d) {
            if(i == (d%10 + d/10))counter++;
        }
    }
    return counter;

}

int main() {

    constexpr int c = count();
    std::cout<<c<<std::endl;
}