import java.util.*

fun main() {
    val builder = StringBuilder()

    var ans = 0

    val currentDay = GregorianCalendar(2015, 0, 1)

    while (currentDay.get(Calendar.YEAR) == 2015) {
        val month = currentDay.get(Calendar.MONTH) + 1
        val day = currentDay.get(Calendar.DAY_OF_MONTH)

        if (month == day / 10 + day % 10) {
            ans++
        }

        currentDay.add(Calendar.DAY_OF_MONTH, 1)
    }

    builder.appendln(ans)

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}