import java.util.*

/**
 * Created by hichikawa on 2015/11/01.
 */

fun main(args: Array<String>) {
    var count = 0
    for(month in 1..12) {
        for(day in 1..31) {
            if ((month == 2 && day == 29)
            || (month <= 6 && month % 2 == 0 && day == 31)
            || (month >= 9 && month % 2 == 1 && day == 31))
                break
            if(month == (day/10 + day%10))
                count++
        }
    }
    println(count)
}