#include <bits/stdc++.h>
#define int long long 
using namespace std;
int n,t,len,l;
int k;
int i,ans;
signed main(){
	cin>>n;
		ans=t=n;
	while(t){
		len++;
		t>>=1;
	}
	l=2;
	for(int j=log(n);j;j--){
		l=(int)pow(n,1.0/j);
		for(int i=l;pow(i,j)<=n;i++){
			
				ans=min(ans,n-(int)pow(i,j)+i+j);
			
		}
		
		//cout<<i<<" "<<j<<" "<<k<<endl;
	}
	cout<<ans<<endl;
	
	
    return 0;
}