#include<bits/stdc++.h>
// #include<atcoder/all>

using namespace std;
// using namespace atcoder;
using ll = long long;
using ull = unsigned long long;
using P = pair<int,int>;
#define rep(i,n) for(ll i = 0;i < (ll)n;i++)
#define ALL(x) (x).begin(),(x).end()
#define MOD 1000000007


int main(){
  
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i,n)cin >> a[i];
  if(!n){
    cout << 0 << "\n";
    return 0;
  }
  int l = 1,r = n+1;
  while(r-l > 1){
    int mid = (l+r)/2;
    vector<int> cnt(2000000);
    int h = 0;
    bool is = false;
    rep(i,mid-1)if(cnt[a[i]]++ == 1)h++;
    for(int i = mid-1;i < n;i++){
      if(i-mid >= 0)if(cnt[a[i]]-- == 2)h--;
      if(cnt[a[i]]++ == 1)h++;
      if(!h)is = true;
    }
    if(is)l = mid;
    else r = mid;
  }
  cout << l << "\n";
  

  return 0;
}