package main

import . "fmt"

func main() {
	var n int
	Scan(&n)
	ans := n+1
	for i := 2; i*i <= n; 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)
}