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

fun PrintWriter.solve() {
    val n = nextLong()
    if (n <= 3) {
        println(n)
        return
    }
    var min = Long.MAX_VALUE
    for (j in 0..60) {
        var l = 1L
        var r = n + 1
        outer@while (r - l > 1) {
            val mid = (l + r) / 2
            var pow = 1L
            for (_i in 0 until j) {
                if (pow > n / mid) {
                    r = mid
                    continue@outer
                }
                pow *= mid
            }
            if (pow > n) {
                r = mid
            } else {
                l = mid
            }
        }
        val i = l
        val k = n - LongArray(j) { i }.fold(1L, Long::times)
        min = min(min, i + j + k)
    }
    println(min)
}

fun main() {
    Thread(null, {
        val writer = PrintWriter(System.out, false)
        writer.solve()
        writer.flush()
    }, "solve", 1.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