#include "bits/stdc++.h"
 
using namespace std;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef vector<PII> VPII;
typedef long long LL;
typedef priority_queue<int> PQ_DESC;
typedef priority_queue<int, vector<int>, greater<int>> PQ_ASC;
typedef priority_queue<PII> PQ_DESC_PII;
typedef priority_queue<PII, vector<PII>, greater<PII>> PQ_ASC_PII;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;
typedef vector<VVLL> VVVLL;
 
#define SORT_ASC(c) sort((c).begin(), (c).end())
#define SORT_DESC(c) sort((c).begin(), (c).end(), greater<typeof((c).begin())>())
 
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define SIZE(a) int((a).size())
 
const double EPS = 1e-10;
const double PI  = acos(-1.0);
 
 
//debug func
template<typename T>
void vecprint(vector<T> v) {
    for(auto x : v) {
        cerr << x << " ";
    }
    cerr << endl;
}
 
template<typename T>
void vecvecprint(vector<vector<T>> vv) {
    REP(i, SIZE(vv)) {
        REP(j, SIZE(vv[i])) {
            cerr << vv[i][j] << " ";
        }
        cerr << endl;
    }
}
 
template<typename T>
void pqprint(priority_queue<T> q) {
    while(!q.empty()) {
        cerr << q.top() << " ";
        q.pop();
    }
    cerr << endl;
}
 
template<typename T>
void qprint(queue<T> q) {
    while(!q.empty()) {
        cerr << q.front() << " ";
        q.pop();
    }
    cerr << endl;
}
 
template<typename T>
void vecqprint(vector<queue<T>> v) {
    for(int i = 0; i < v.size(); i++) {
        qprint(v[i]);
    }
}
 
template <typename Iterator>
inline bool next_combination(const Iterator first, Iterator k, const Iterator last)
{
   /* Credits: Thomas Draper */
   if ((first == last) || (first == k) || (last == k))
      return false;
   Iterator itr1 = first;
   Iterator itr2 = last;
   ++itr1;
   if (last == itr1)
      return false;
   itr1 = last;
   --itr1;
   itr1 = k;
   --itr2;
   while (first != itr1)
   {
      if (*--itr1 < *itr2)
      {
         Iterator j = k;
         while (!(*itr1 < *j)) ++j;
         iter_swap(itr1,j);
         ++itr1;
         ++j;
         itr2 = k;
         rotate(itr1,j,last);
         while (last != j)
         {
            ++j;
            ++itr2;
         }
         rotate(k,itr2,last);
         return true;
      }
   }
   rotate(first,k,last);
   return false;
}
 
inline double get_time_sec(void){
    return static_cast<double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count())/1000000000;
}
 
template<typename T>
T gcd(T a, T b) {
    if(a > b) swap(a, b);
    if(a == 0) return b;
    else return gcd(b%a, a);
}
 
template<typename T>
map<T, T> prime_list(T n) {
    map<T, T> ret;
    for(T i = 2; i*i <= n; i++) {
        if(n % i == 0) {
            ret[i] = 0;
            while(n % i == 0) {
                n /= i;
                ret[i]++;
            }
        } 
    }
    if(n != 1) ret[n]++;
    return ret;
}
 
int main(void) {
    int n;
    cin >> n;
    map<int, int> mo, me;
    int ce=0, co=0;
    REP(i, n) {
        int tmp;
        cin >> tmp;
        if(i % 2 == 0) {
            if(me.count(tmp)) me[tmp]++;
            else me[tmp] = 1;
            ce++;
        } else {
            if(mo.count(tmp)) mo[tmp]++;
            else mo[tmp] = 1;
            co++;
        }
    }
    VPII vpe(ce, PII(0, 0)), vpo(co, PII(0, 0));
    int idx=0, jdx=0;
    for(auto x : me) {
        cerr << x.first << " " << x.second << endl;
        vpe[idx] = x;
        idx++;
    }
    cerr << endl;
    for(auto x : mo) {
        cerr << x.first << " " << x.second << endl;
        vpo[jdx] = x;
        jdx++;
    }
    cerr << endl;
    cerr << ce << " " << co << endl << endl;;
    auto cmp = [](PII x, PII y){return x.second > y.second;};
    sort(vpe.begin(), vpe.end(), cmp);
    sort(vpo.begin(), vpo.end(), cmp);
    if(vpe[0].first != vpo[0].first) {
        cout << ce-vpe[0].second+co-vpo[0].second << endl;
    } else {
        cerr << "hoge" << endl;
        if(ce == vpe[0].second && co == vpo[0].second){
            cout << min(ce, co) << endl;
        } else if(ce == vpe[0].second) {
            cout << min(vpe[0].second+co-vpo[0].second, co-vpo[1].second) << endl;
        } else if(co == vpo[0].second) {
            cout << min(ce-vpe[1].second, ce-vpe[0].second+vpo[0].second) << endl;
        } else {
            cout << min(ce-vpe[1].second+co-vpo[0].second, ce-vpe[0].second+co-vpo[1].second) << endl;
        }
    }
}

Measured memory_bytes: 5760