//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//  MMMMMMMMMMMMMMMMNOtXtdMMMMMNxzZMMNmgHyVVVVVW%..?/(.,(x-..........(HfffpffpffpffWHHffpffppfVyyWMMMMMM


//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

int main() {

    while (true) {

        int n;
        cin >> n;

        if (n == 0) break;

        vector<int> a(n);
        for (int i = 0; i < n; i++) scanf("%d", &a[i]);

        int ans = n;
        for (int p = 0; p < n; p++) {
            int ori = a[p];
            for (int c = 1; c <= 3; c++) {
                if (c == ori) continue;
                int sum = 0;
                a[p] = c;
                int l = p, r = p;
                while (l >= 0 && a[l] == c)l--;
                while (r < n && a[r] == c) r++;
                sum += p - l + r - p - 1;
                if (sum <= 3) continue;
                vector<pair<int, int>> left;
                vector<pair<int, int>> right;
                for (int i = l, j = l; i >= 0; i = j) {
                    while (j >= 0 && a[i] == a[j]) j--;
                    left.push_back(make_pair(a[i], i - j));
                }
                for (int i = r, j = r; i < n; i = j) {
                    while (j < n && a[i] == a[j])j++;
                    right.push_back(make_pair(a[i], j - i));
                }
                for (int i = 0; i < min(left.size(), right.size()); i++) {
                    if (left[i].first != right[i].first) break;
                    if (left[i].second + right[i].second <= 3) break;
                    sum += left[i].second + right[i].second;
                }
                ans = min(ans, n - sum);
            }
            a[p] = ori;
        }

        cout << ans << endl;
    }

    return 0;
}






































Measured memory_bytes: 3268