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*/

#include <bits/stdc++.h>
using namespace std;

using VI = vector<int>;
using VVI = vector<VI>;
using PII = pair<int, int>;
using LL = long long;
using VL = vector<LL>;
using VVL = vector<VL>;
using PLL = pair<LL, LL>;
using VS = vector<string>;

#define ALL(a)  begin((a)),end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define MT make_tuple
#define SZ(a) int((a).size())
#define SORT(c) sort(ALL((c)))
#define RSORT(c) sort(RALL((c)))
#define UNIQ(c) (c).erase(unique(ALL((c))), end((c)))

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

#define FF first
#define SS second

template<class S, class T>
istream& operator>>(istream& is, pair<S,T>& p){
  return is >> p.FF >> p.SS;
}
template<class T>
istream& operator>>(istream& is, vector<T>& xs){
  for(auto& x: xs)
	is >> x;
  return is;
}
template<class S, class T>
ostream& operator<<(ostream& os, const pair<S,T>& p){
  return os << p.FF << " " << p.SS;
}
template<class T>
ostream& operator<<(ostream& os, const vector<T>& xs){
  for(unsigned int i=0;i<xs.size();++i)
	os << (i?" ":"") << xs[i];
  return os;
}
template<class T>
void maxi(T& x, T y){
  if(x < y) x = y;
}
template<class T>
void mini(T& x, T y){
  if(x > y) x = y;
}
void debug(istringstream&){}
template <char sep=',', class Head, class... Tail>
void debug(istringstream& iss, Head&& head, Tail&&... tail)
{
  string name;
  getline(iss, name, ',');
  cout << sep << name << "=" << head;
  debug(iss, forward<Tail>(tail)...);
}

#ifdef PYONPOI
#define DEBUG(...) \
  do{ \
    istringstream ss(#__VA_ARGS__); \
    debug<' '>(ss, __VA_ARGS__); \
    cout<<endl; \
  }while(0)
#else
#define DEBUG
#endif


const double EPS = 1e-10;
const double PI  = acos(-1.0);
const LL MOD = 1e9+7;
const LL INF = 1e16;


LL dp[200010][5];

int main(){
  cin.tie(0);
  ios_base::sync_with_stdio(false);

  int N;
  cin >> N;
  VL xs(N);
  cin >> xs;

  fill((LL*)dp, (LL*)dp+200010*5, INF);
  dp[0][0] = 0;

  REP(i,N){
    LL x = xs[i];
    LL b = x % 2;
    LL be = b ^ 1;

    if(x == 0){
      b = 2;
      be = 1;
    }

    dp[i+1][0] = dp[i][0] + x;
    dp[i+1][1] = min(dp[i][0] + b, dp[i][1] + b);
    dp[i+1][2] = min({dp[i][0] + be, dp[i][1] + be, dp[i][2] + be});
    dp[i+1][3] = min({dp[i][2] + b, dp[i][3] + b});
    dp[i+1][4] = min({dp[i][1] + x, dp[i][2] + x, dp[i][3] + x, dp[i][4] + x});
  }
//DEBUG(dp[N][0], dp[N][2], dp[N][3], dp[N][4] );

  cout << min({dp[N][0], dp[N][1], dp[N][2], dp[N][3], dp[N][4] }) << endl;

  return 0;
}

Measured memory_bytes: 9600