import java.util.*;

public class Main{
    public static int  pow(int a,int b){
        int res=1;
        while (b>0){
            if (b%2==1){
                res*=a;
            }
            a*=a;b>>=1;
        }
        return res;
    }
    public static int pow(int a,int b,int mod){
        int res=1;
        while (b>1){
            if (b%2==1){
                res=res*a%mod;
            }
            a=a*a%mod;b>>=1;
        }
        return res;
    }
    public static int abs(int a){
        if (a<0){
            return -a;
        }
        return a;
    }
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int [] a={0,31,28,31,30,31,30,31,31,30,31,30,31};int ans=0;
        for (int i=1;i<=12;i++){
            for (int j=1 ;j<=a[i];j++){
                int c=0;
                int d=j;
                while (d>0){
                    c+=d%10;d/=10;
                }
                if (i==c){
                    ans+=1;
                }
            }  
        }
        System.out.println(ans);
        sc.close();
    }
}