package main

import . "fmt"
import . "math"

func sqrt(a int) int {
	x := int(Sqrt(float64(a)))
	if x*x < a {
		x++
	}
	if a < x*x {
		x--
	}
	return x
}

func cbrt(a int) int {
	x := int(Cbrt(float64(a)))
	if x*x*x < a {
		x++
	}
	if a/x < x*x {
		x--
	}
	return x
}

func main() {
	var n int
	Scan(&n)
	ans := sqrt(n)+2+(n-sqrt(n)*sqrt(n))
	ans = min(ans, cbrt(n)+3+(n-cbrt(n)*cbrt(n)*cbrt(n)))
	for i := 2; i <= 4; i++ {
		j := 0
		ij := 1
		ans = min(ans, i+j+(n-ij))
		for ij <= n/i {
			j++
			ij *= i
			ans = min(ans, i+j+(n-ij))
		}
	}
	Println(ans)
}