#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	long long n;
	cin>>n;
	
	long long ans = n;
	
	
	for(long long i=2;i<=1000000;i++){
		long long nn = n;
		long long cur = 1;
		rep(j,100){
			if(cur>n)break;
			ans = min(ans,i+j+(n-cur));
			if(nn/i==0)break;
			nn /= i;
			cur *= i;
		}		
	}
	
	long long ok = 0,ng = 1000000001;
	while(ng-ok>1LL){
		long long mid = (ok+ng)/2;
		if(mid*mid>n)ng = mid;
		else ok = mid;
	}
	ans = min(ans,ok+2+(n-ok*ok));
	
	cout<<ans<<endl;
	
	return 0;
}