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

void main(){
    auto dates = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    int cnt = 0;

    foreach(m ; 1 .. 12 + 1){
        foreach(d ; 1 .. dates[m] + 1){
            cnt += (m == (d / 10 + d % 10));
        }
    }

    cnt.writeln;
}