import java.io.*;

// 処理
class Process {
    Process() {}

    private int sumOfDateNum(int num) {
        int sum = 0;
        while(num > 0) {
            sum += (num % 10);
            num /= 10;
        }
        
        return sum;
    }

    int getResult() {
        int countOfHappyDay = 0;
        for(int m = 1; m <= 12; m++) {
            for(int d = 1; d <= 31; d++) {
                if(sumOfDateNum(d) == m) {
                    countOfHappyDay++;
                }
                
                if((m == 2) && (d == 28)) {
                    break;
                }
                
                if(((m == 4) || (m == 6) || (m == 9) || (m == 11)) && (d == 30)) {
                    break;
                }
            }
        }
        return countOfHappyDay;
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 出力
        printWriter.println((new Process()).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}