#include <bits/stdc++.h>
using namespace std;
const double inf = 1e18;
const double eps = 1e-6;
const int maxn = 100010;
const int mod = 1000000007;
int a[maxn];
double b[maxn], c[maxn];
int main() {
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  for (int i = 2; i <= n; i++) {
    if (a[i] == 0)
      b[i] = 0;
    else if (a[i - 1] == 0)
      b[i] = inf;
    else
      b[i] = a[i] * 1.0 / a[i - 1];
  }
  for (int i = 3; i <= n; i++) {
    if (a[i] == 0)
      c[i] = 0;
    else if (a[i - 2] == 0)
      c[i] = inf;
    else
      c[i] = a[i] * 1.0 / a[i - 2];
  }
  int flag = 1, ans = 2;
  for (int i = 2; i <= n; i++) {
    if (abs(b[i] - b[2]) > eps || abs(b[i] - inf) < eps) {
      flag = 0;
      break;
    }
  }
  if (flag) ans = 0;
  flag = 1;
  for (int i = 3; i <= n; i++) {
    if (abs(b[i] - b[3]) > eps) {
      flag = 0;
      break;
    }
  }
  if (flag) ans = min(ans, 1);
  flag = 1;
  for (int i = 4; i <= n; i++) {
    if (abs(b[i] - c[3]) > eps) {
      flag = 0;
      break;
    }
  }
  if (flag) ans = min(ans, 1);
  flag = 1;
  int temp = 0;
  if (abs(b[2] - inf) > eps) {
    for (int i = 3; i <= n; i++) {
      if (abs(b[i] - b[2]) > eps) {
        if (i < n && temp == 0 && abs(c[i + 1] - b[2]) < eps) {
          i++;
          temp = 1;
        } else if (i != n || temp != 0) {
          flag = 0;
          break;
        }
      }
    }
    if (flag) ans = min(ans, 1);
  }
  cout << ans << "\n";
  return 0;
}
