package main

import "fmt"

// days of the month in 2015
var days = []int{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}

func main() {
	ans := 0
	for m := 1; m < len(days); m++ {
		for d := 1; d <= days[m]; d++ {
			if m == (d/10 + d%10) {
				ans++
			}
		}
	}
	fmt.Println(ans)
}