import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No0188 {
    
    static final Scanner in = new Scanner(System.in);
    static final PrintWriter out = new PrintWriter(System.out,false);
    static int[] days = {0,31,28,31,30,31,30,31,31,30,31,30,31};

    static void solve() {
        int 誕生日おめでとうございます = 0;
        for (int i=1; i<=12; i++) {
            for (int j=1; j<=days[i]; j++) {
                if (j < 10 && i == j) 誕生日おめでとうございます++;
                else if (j >= 10 && i == j/10 + j%10) 誕生日おめでとうございます++;
            }
        }
        out.println(誕生日おめでとうございます);
    }

    public static void main(String[] args) {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        in.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(deepToString(o));}
}