#include <bits/stdc++.h>
int main() {
  int32_t num_elements;
  std::cin >> num_elements;
  int32_t* elements = new int32_t[num_elements];
  for (int32_t i = 0; i < num_elements; i++) std::cin >> elements[i];
  bool has_zero = false;
  int32_t num_zeroes = 0;
  for (int32_t i = 0; i < num_elements; i++)
    if (elements[i] == 0) {
      has_zero = true;
      num_zeroes++;
    }
  if (has_zero) {
    if (num_zeroes == num_elements ||
        (num_zeroes == num_elements - 1 && elements[0] != 0))
      std::cout << 0;
    else {
      if (num_zeroes == num_elements - 1 ||
          (num_zeroes == num_elements - 2 && elements[0] != 0))
        std::cout << 1;
      else if (num_zeroes == 1) {
        int32_t index_of_zero;
        for (int32_t i = 0; i < num_elements; i++)
          if (elements[i] == 0) {
            index_of_zero = i;
            break;
          }
        std::vector<double> deltas;
        for (int32_t i = 1; i < num_elements; i++) {
          if (i == index_of_zero) continue;
          if (i == index_of_zero + 1) {
            if (i > 1)
              deltas.push_back((double)elements[i] / (double)elements[i - 2]);
          } else
            deltas.push_back((double)elements[i] / (double)elements[i - 1]);
        }
        bool equal = true;
        for (int32_t i = 1; i < deltas.size(); i++)
          if (fabs(deltas[i] - deltas[0]) > 0.000001) {
            equal = false;
            break;
          }
        if (equal) {
          std::cout << 1;
        } else {
          std::cout << 2;
        }
      } else
        std::cout << 2;
    }
    return 0;
  }
  std::vector<double> deltas;
  for (int32_t i = 1; i < num_elements; i++)
    deltas.push_back((double)elements[i] / (double)elements[i - 1]);
  bool equal = true;
  for (int32_t i = 1; i < deltas.size(); i++)
    if (fabs(deltas[i] - deltas[0]) > 0.000001) {
      equal = false;
      break;
    }
  if (equal) {
    std::cout << 0;
    return 0;
  }
  bool equal_without_1 = true;
  for (int32_t i = 2; i < deltas.size(); i++)
    if (fabs(deltas[i] - deltas[1]) > 0.000001) {
      equal_without_1 = false;
      break;
    }
  bool equal_without_last = true;
  for (int32_t i = 1; i < deltas.size() - 1; i++)
    if (fabs(deltas[i] - deltas[0]) > 0.000001) {
      equal_without_last = false;
      break;
    }
  if (equal_without_1 || equal_without_last) {
    std::cout << 1;
    return 0;
  }
  int32_t first_weird;
  for (int32_t i = 1; i < deltas.size(); i++)
    if (fabs(deltas[i] - deltas[0]) > 0.000001) {
      first_weird = i;
      break;
    }
  bool can_delete = true;
  for (int32_t i = first_weird + 2; i < deltas.size(); i++) {
    if (fabs(deltas[i] - deltas[0]) > 0.000001) {
      can_delete = false;
      break;
    }
  }
  can_delete = can_delete && fabs((double)elements[first_weird + 2] /
                                      (double)elements[first_weird] -
                                  deltas[0]) <= 0.000001;
  std::cout << (can_delete ? 1 : 2);
  return 0;
}
