package main

import (
  "fmt"
  "strconv"
  "strings"
)

func main() {
  day_max, happy_day := 0, 0
  
  for month := 1; month <= 12; month++ {
    switch month {
    case 2: day_max = 28
    case 4, 6, 9, 11: day_max = 30
    default: day_max = 31
    }
    for day := 1; day <= day_max; day++ {
      sum := 0
      if day < 10 {
        sum += day
      } else {
        tmp := strings.Split(strconv.Itoa(day), "")
        switch tmp[0] {
        case "1": sum += 1 + day - 10
        case "2": sum += 2 + day - 20
        case "3": sum += 3 + day - 30
        }
      }
      if month == sum {
        happy_day++
      }
    }
  }
  fmt.Println(happy_day)
}