#include <bits/stdc++.h>
//eolibraries
#define lnf 3999999999999999999
#define inf 999999999
#define fi first
#define se second
#define pb push_back
#define ll long long
#define ld long double
#define all(c) (c).begin(),(c).end()
#define sz(c) (int)(c).size()
#define make_unique(a) sort(all(a)),a.erase(unique(all(a)),a.end());
#define rep(i,n) for(int i=0;i<n;i++)
#define drep(i,n) for(int i=n-1;i>=0;i--)
#define crep(i,x,n) for(int i=x;i<n;i++)
#define vec(...) vector<__VA_ARGS__>
#define _3sSOzgI ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
//eodefine
using namespace std;
using pii=pair<int,int>;
using vi=vec(int);
const int mxn=12000;

int main(){
_3sSOzgI;
	ll n;
	cin>>n;
	ll ans=n;
	for(int j=1;j<=60;j++){
		ll l=1,r=n,c=-1,up=-1;
		while(l<=r){
			ll m=(l+r)/2;
			int jj=j;
			bool pok=1;
			ll e=1;
			while(jj>0){
				if(e>n or e>n/m) pok=0;
				e*=m;
				jj--;
			}
			if(pok){
				c=m;
				up=e;
				l=m+1;
			}else{
				r=m-1;
			}
		}
		if(j==0) cout<<c<<"\n";
		if(c!=-1) ans=min(ans,c+j+(n-up));
	}
	cout<<ans<<"\n";
//	
	return 0;
}