using System;
using System.Linq;
using System.Collections.Generic;
using static System.Console;

public class hello{
    public static void Main(){

        //No.188 HAPPY DAY  X月Y日についてYの数字和がXと等しいとき
        int[] d = {0,31,28,31,30,31,30,31,31,30,31,30,31};
        var sum =0;
        
        for(int m=1;m<d.Length;m++  ){
            for(int j=1;j<=d[m];j++){

                var h = (int)(j/10) ;
                var t = j-h*10;
        
                if(m == (h+t)) {
                    sum++;
                    //WriteLine(m + " " + h + " " + t);
                }    
            }
        }
        WriteLine(sum);
    }
}