import std.stdio, std.algorithm, std.array, std.conv, std.string;

int[13] days = [2, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

void main()
{
    int hp = 0;
    foreach(i; 1..13) {
        for(int j = 1; j <= days[i]; ++j) {
            if (i == j / 10 + j % 10) hp++;
        }
    }
    writeln(hp);
}