#include <bits/stdc++.h>
using namespace std;
int c[100001], s[100001];
int mx, ans, n, nc, ns;
int i, j;
void checkAns(int k) {
  if (ns <= 2) {
    if ((mx - 1) * nc == (i - 1) || mx * (nc - 1) == (i - 1)) {
      if (s[1] == 1 || s[1] == i || 1 == nc || s[mx] == 1) {
        ans = i;
      }
    }
  }
}
int main() {
  int k;
  cin >> n;
  for (i = 1; i <= n; ++i) {
    cin >> j;
    k = c[j];
    if (k) {
      s[k]--;
      if (!s[k]) {
        ns--;
      }
    } else {
      nc++;
    }
    c[j]++;
    k++;
    if (!s[k]) {
      ns++;
    }
    s[k]++;
    if (k > mx) {
      mx = k;
    }
    checkAns(k);
  }
  cout << ans << endl;
  return 0;
}
