typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    ll n;
    std::cin >> n;
    if(n==1){
        std::cout << 1 << std::endl;
        return 0;
    }else if(n==2){
        std::cout << 2 << std::endl;
        return 0;
    }
    ll ans = n-1;
    for (int j = 1; j <= 59; j++) {
        ll i = floor(powl(n,(ld)(1.0/(ld)j))+0.00000000000001);
        // std::cout << i << std::endl;
        ans = min(ans, i+j+(ll)(n-powl(i,j)));
    }
    std::cout << ans << std::endl;
}