#include <bits/stdc++.h>
using namespace std;
const int LIM_N = 1e5 + 5;
int main() {
  int N;
  long long nums[LIM_N];
  scanf("%d", &N);
  for (int i = 0; i < N; i++) scanf("%lld", &nums[i]);
  if (N == 1) {
    printf("0\n");
    return 0;
  }
  bool ans[3] = {false, false, true};
  for (int w = 0; w < 2; w++) {
    for (int i = 0; i < 3 && i < N; i++) {
      for (int j = i + 1; j < 3 && j < N; j++) {
        if (nums[i] && nums[j] % nums[i]) continue;
        long long c = nums[i];
        long long b = c ? nums[j] / c : 1;
        if (b == 0 && w) continue;
        int rep = 0;
        for (int k = 0; k < N && rep < 2; k++) {
          if (nums[k] != c) {
            rep++;
            continue;
          }
          c *= b;
        }
        if (rep < 2) ans[rep] = true;
      }
    }
    reverse(nums, nums + N);
  }
  for (int i = 0; i < 3; i++)
    if (ans[i]) {
      printf("%d\n", i);
      return 0;
    }
}
