#include <bits/stdc++.h>
using namespace std;
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
// 任意長整数型
using Bint = mp::cpp_int;
// 仮数部が10進数で1024桁の浮動小数点数型(TLEしたら小さくする)
using Real = mp::number<mp::cpp_dec_float<1024>>;

Bint mypow(Bint x,Bint n){
    Bint res=1;
    while(n>0){
        if(n&1){
            res=res*x;
        }
        x=x*x;
        n>>=1;
    }
    return res;
}

int main(){
    Bint N;
    cin>>N;
    Bint ans=N;
    Bint j=2;
    while(mypow(2,j)<=N){
        Bint left=0,right=N+10;
        while(right-left>1){
            Bint mid=left+(right-left)/2;
            if(mypow(mid,j)>N){
                right=mid;
            }else{
                left=mid;
            }
        }
        ans=min(ans,left+j+N-mypow(left,j));
        j++;
    }
    cout<<ans<<endl;
    return 0;
}