#include <bits/stdc++.h>
using namespace std;
template <class T1, class T2>
ostream& operator<<(ostream& os, pair<T1, T2> p) {
  os << "{" << p.first << ", " << p.second << "}";
  return os;
}
int check(vector<long long>& v) {
  int n = v.size();
  long long c = v[0];
  double d;
  if (c == 0 && v[1] == 0)
    d = 0;
  else if (c == 0 && v[1] != 0)
    return 2;
  else
    d = v[1] / (c * 1.0l);
  double num = v[1];
  long long cnt = 0;
  for (int i = 2; i < n && cnt <= 2; ++i) {
    double old_num = num;
    num = num * d;
    if (fabs(v[i] - num) < 1E-10l) continue;
    cnt++;
    num = old_num;
  }
  return cnt;
}
int main() {
  int n;
  cin >> n;
  vector<long long> v(n, 0);
  for (int i = 0; i < n; ++i) cin >> v[i];
  if (n <= 2) {
    if (n == 1)
      cout << 0 << endl;
    else {
      if (v[0] != 0) {
        cout << 0 << endl;
      } else {
        if (v[1] != 0)
          cout << 1 << endl;
        else
          cout << 0 << endl;
      }
    }
  } else {
    vector<long long> v1(n - 1, 0);
    for (int i = 1; i < n; ++i) v1[i - 1] = v[i];
    vector<long long> v2(n - 1, 0);
    v2[0] = v[0];
    for (int i = 2; i < n; ++i) v2[i - 1] = v[i];
    int ch0 = check(v);
    if (ch0 <= 1)
      cout << ch0 << endl;
    else {
      int ch1 = check(v1);
      int ch2 = check(v2);
      if (ch1 == 0 || ch2 == 0)
        cout << 1 << endl;
      else
        cout << 2 << endl;
    }
  }
  return 0;
}
