import java.io.PrintWriter
import java.util.*
import kotlin.math.*

fun PrintWriter.solve() {
    val n = nextInt()
    var ans = 0L
    for (a in 0..9) {
        for (b in 0..9) {
            if (a == b) continue
            val start = maxOf(a, b) + 1L
            var left = maxOf(a, b) + 1L
            if (left * left - a * n * left - b * n - 1 >= 0) continue
            var right = 1000000002L
            while (right - left > 1) {
                val mid = (left + right) / 2
                if (mid * mid - a * n * mid - b * n - 1 < 0) {
                    left = mid
                } else {
                    right = mid
                }
            }
            ans += left - start + 1
        }
    }
    println(ans)
}

fun main() {
    Thread(null, {
        val writer = PrintWriter(System.out, false)
        writer.solve()
        writer.flush()
    }, "solve", abs(1L.shl(26)))
        .apply { setUncaughtExceptionHandler { _, e -> e.printStackTrace(); kotlin.system.exitProcess(1) } }
        .apply { start() }.join()
}

// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()

fun next(): String {
    while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
    return st.nextToken()
}

fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
// endregion