#define _CRT_SECURE_NO_WARNINGS

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <limits>
#include <ctime>
#include <cassert>
#include <map>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <stack>
#include <queue>
#include <numeric>
#include <iterator>
#include <bitset>
#include <unordered_map>
#include <unordered_set>

using namespace std;
#define FOR(i,n) for(int i = 0; i < (n); i++)
#define sz(c) ((int)c.size())
#define ten(n) ((int)1e##n)
using ll = long long;
using Pii = pair<int, int>;
using Pll = pair<ll, ll>;

template<typename ...> static inline int getchar_unlocked(void) { return getchar(); }
template<typename ...> static inline void putchar_unlocked(int c) { putchar(c); }
#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)
void reader(int& x) { int k, m = 0; x = 0; for (;;) { mygc(k); if (k == '-') { m = 1; break; }if ('0' <= k&&k <= '9') { x = k - '0'; break; } }for (;;) { mygc(k); if (k<'0' || k>'9')break; x = x * 10 + k - '0'; }if (m) x = -x; }
void reader(ll& x) { int k, m = 0; x = 0; for (;;) { mygc(k); if (k == '-') { m = 1; break; }if ('0' <= k&&k <= '9') { x = k - '0'; break; } }for (;;) { mygc(k); if (k<'0' || k>'9')break; x = x * 10 + k - '0'; }if (m) x = -x; }
int reader(char c[]) { int i, s = 0; for (;;) { mygc(i); if (i != ' '&&i != '\n'&&i != '\r'&&i != '\t'&&i != EOF) break; }c[s++] = i; for (;;) { mygc(i); if (i == ' ' || i == '\n' || i == '\r' || i == '\t' || i == EOF) break; c[s++] = i; }c[s] = '\0'; return s; }
int reader(string& c) { int i; for (;;) { mygc(i); if (i != ' '&&i != '\n'&&i != '\r'&&i != '\t'&&i != EOF) break; }c.push_back(i); for (;;) { mygc(i); if (i == ' ' || i == '\n' || i == '\r' || i == '\t' || i == EOF) break; c.push_back(i); }; return sz(c); }
template <class T, class S> void reader(T& x, S& y) { reader(x); reader(y); }
template <class T, class S, class U> void reader(T& x, S& y, U& z) { reader(x); reader(y); reader(z); }
template <class T, class S, class U, class V> void reader(T& x, S& y, U& z, V & w) { reader(x); reader(y); reader(z); reader(w); }
void writer(int x, char c) { int s = 0, m = 0; char f[10]; if (x<0)m = 1, x = -x; while (x)f[s++] = x % 10, x /= 10; if (!s)f[s++] = 0; if (m)mypc('-'); while (s--)mypc(f[s] + '0'); mypc(c); }
void writer(ll x, char c) { int s = 0, m = 0; char f[20]; if (x<0)m = 1, x = -x; while (x)f[s++] = x % 10, x /= 10; if (!s)f[s++] = 0; if (m)mypc('-'); while (s--)mypc(f[s] + '0'); mypc(c); }
void writer(const char c[]) { int i; for (i = 0; c[i] != '\0'; i++)mypc(c[i]); }
void writer(const string& x, char c) { int i; for (i = 0; x[i] != '\0'; i++)mypc(x[i]); mypc(c); }
void writer(const char x[], char c) { int i; for (i = 0; x[i] != '\0'; i++)mypc(x[i]); mypc(c); }
template<class T> void writerLn(T x) { writer(x, '\n'); }
template<class T, class S> void writerLn(T x, S y) { writer(x, ' '); writer(y, '\n'); }
template<class T, class S, class U> void writerLn(T x, S y, U z) { writer(x, ' '); writer(y, ' '); writer(z, '\n'); }
template<class T, class S, class U, class V> void writerLn(T x, S y, U z, V v) { writer(x, ' '); writer(y, ' '); writer(z, ' '); writer(v, '\n'); }
template<class T> void writerArr(T x[], int n) { if (!n) { mypc('\n'); return; }FOR(i, n - 1)writer(x[i], ' '); writer(x[n - 1], '\n'); }
template<class T> void writerArr(vector<T>& x) { writerArr(x.data(), (int)x.size()); }

template<class T> void chmin(T& a, const T& b) { if (a > b) a = b; }
template<class T> void chmax(T& a, const T& b) { if (a < b) a = b; }

template<class T> T gcd(T a, T b) { return b ? gcd(b, a % b) : a; }
template<class T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
ll mod_pow(ll a, ll n, ll mod) {
	ll ret = 1;
	ll p = a % mod;
	while (n) {
		if (n & 1) ret = ret * p % mod;
		p = p * p % mod;
		n >>= 1;
	}
	return ret;
}
template<class T> T extgcd(T a, T b, T& x, T& y) { for (T u = y = 1, v = x = 0; a;) { T q = b / a; swap(x -= q * u, u); swap(y -= q * v, v); swap(b -= q * a, a); } return b; }
ll mod_inv(ll a, ll m) { ll x, y; extgcd<ll>(a, m, x, y); return (m + x % m) % m; }

#ifdef _WIN32
template <typename ... Args>
void debugPrintf(const char *format, Args const & ... args) {
	fprintf(stdout, format, args ...);
	fflush(stdout);
}
#else
#define debugPrintf(...)
#endif

struct Q {
	ll f, s;
	// bool operator<= (const Q& r) const {
	//	ll sdiff = s - r.s;
	//	if (sdiff >= 30) {
	//		return false;
	//	} else if (sdiff <= -30) {
	//		return true;
	//	}

	//	ll cf = f, rf = r.f;
	//	if (sdiff > 0) cf *= pow2[sdiff];
	//	if (sdiff < 0) rf *= pow2[-sdiff];

	//	return cf <= rf;
	//}
};

ll fourDiff(Q l, Q r) {
	ll diff = 0;
	while (l.f > r.f) {
		r.f *= 4;
		diff -= 1;
	}
	while (l.f * 4 <= r.f) {
		l.f *= 4;
		diff += 1;
	}

	ll sdiff = r.s - l.s;
	return diff + sdiff;
}

struct P {
	Q l, r;
	int len;
};



vector<ll> f(vector<ll> a) {
	int n = sz(a);
	vector<P> v;
	vector<ll> ret;
	ll ans = 0;
	for (int i = n - 1; i >= 0; i--) {
		P p{ Q{a[i], 0}, Q{a[i], 0}, 1 };
		v.push_back(p);

		while (sz(v) >= 2) {
			auto nxt = v[sz(v) - 2];
			auto cur = v[sz(v) - 1];
			ll diff = fourDiff(cur.r, nxt.l);
			if (diff < 0) {
				ll add = abs(diff);
				nxt.l.s += add;
				nxt.r.s += add;
				ans += add * nxt.len;
				diff = 0;
			}

			if (diff == 0) {
				v.pop_back();
				v.pop_back();

				P np;
				np.l = cur.l;
				np.r = nxt.r;
				np.len = cur.len + nxt.len;
				v.push_back(np);
			} else {
				break;
			}
		}

		ret.push_back(ans);
	}
	
	reverse(ret.begin(), ret.end());
	return ret;
}

int main() {
	int n; reader(n);
	vector<ll> a(n); FOR(i, n) reader(a[i]);

	auto dp = f(a);
	reverse(a.begin(), a.end());
	auto rp = f(a);

	ll ans = numeric_limits<ll>::max();
	FOR(i, n + 1) {
		ll invAns = 0;
		if (i) {
			invAns = rp[n - i];
		}

		ll lAns = 0;
		if (i < n) {
			lAns = dp[i];
		}

		ll cans = (invAns + lAns) * 2 + i;

		// debugPrintf("%d\n", cans);

		ans = min(ans, cans);
	}

	writerLn(ans);

}




Measured memory_bytes: 8532