package main

import . "fmt"
import . "math"

func xrt(a, x int) int {
	p := int(Pow(float64(a),1/float64(x)))
	for {
		pp := 1
		for i := 0; i < x-1; i++ {
			pp *= p
		}
		if pp < a/p {
			p++
		} else if pp > a/p{
			p--
			break
		} else {
			break
		}
	}
	return p
}


func main() {
	var n int
	Scan(&n)
	ans := n+1
	for j := 2; j <= 62; j++ {
		i := xrt(n, j)
		ij := 1
		for a := 0; a < j; a++ {
			ij *= i
			k := n-ij
			ans = min(ans, i+a+1+k)
		}
	}
	Println(ans)
}