import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        int[] cal = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

        int[] days = new int[40];
        for (int i = 0; i <= 3; i++) {
            for (int j = 0; j <= 9; j++) {
                days[i * 10 + j] = i + j;
            }
        }
        int counter = 0;
        for (int i = 1; i <= 12; i++) {
            for (int j = 1; j <= cal[i - 1]; j++) {
                if (i == days[j]) {

                    counter += 1;
                }

            }
        }

        System.out.println(counter);
    }
}