import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int cnt = 0, tmp, sum;
		for(int i = 1; i <= 30; i++){
			sum = 0;
			tmp = i;
			while(tmp>0){
				sum += tmp%10;
				tmp /= 10;
			}
			if(0<sum && sum<13){
				cnt++;
			}
		}
		System.out.println(cnt);
	}
}