#include <bits/stdc++.h>
int seq[100010], seq1[100010], seq2[100010], seq3[100010], superfinalmark = 0;
int main() {
  int n, nzero = 0, finalmark = -1, it1 = 0, it2 = 0, it3 = 0;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%d", &seq[i]);
    if (seq[i] == 0) nzero++;
  }
  if (nzero == n) {
    printf("0\n");
    return 0;
  }
  if (nzero == n - 1 && seq[0] != 0) {
    printf("0\n");
    return 0;
  }
  if (nzero == n - 1 && n > 2) {
    printf("1\n");
    return 0;
  }
  if (nzero == n - 2 && seq[0] != 0 && n >= 4) {
    printf("1\n");
    return 0;
  }
  if (n == 1) {
    printf("0\n");
    return 0;
  }
  if (n == 2) {
    if (nzero == 0) {
      printf("0\n");
      return 0;
    } else if (seq[0] > 0) {
      printf("0\n");
      return 0;
    } else {
      printf("1\n");
      return 0;
    }
  }
  if (n == 3 && nzero == 2 && seq[0] != 0) {
    printf("1\n");
    return 0;
  }
  if (nzero < n && nzero >= 2) {
    printf("2\n");
    return 0;
  }
  if (n == 3)
    if (nzero == 1) {
      printf("1\n");
      return 0;
    }
  if (nzero == 1) {
    int p;
    for (p = 0; seq[p] != 0; p++)
      ;
    for (int i = p + 1; i < n; i++) seq[i - 1] = seq[i];
    n--;
  }
  for (int i = 0; i < n - 2; i++)
    if (((double)seq[i + 1] / seq[i] - (double)seq[i + 2] / seq[i + 1]) >
            1e-9 ||
        ((double)seq[i + 1] / seq[i] - (double)seq[i + 2] / seq[i + 1]) <
            -1e-9) {
      if (nzero == 1) {
        printf("2\n");
        return 0;
      } else {
        finalmark = i;
        break;
      }
    }
  if (finalmark == -1) {
    printf("%d\n", nzero);
    return 0;
  }
  if (n == 3) {
    printf("1\n");
    return 0;
  }
  for (int i = 0; i < n; i++) {
    if (i != finalmark) seq1[it1++] = seq[i];
    if (i != finalmark + 1) seq2[it2++] = seq[i];
    if (i != finalmark + 2) seq3[it3++] = seq[i];
  }
  for (int i = 0; i < n - 3; i++)
    if (((double)seq1[i + 1] / seq1[i] - (double)seq1[i + 2] / seq1[i + 1]) >
            1e-9 ||
        ((double)seq1[i + 1] / seq1[i] - (double)seq1[i + 2] / seq1[i + 1]) <
            -1e-9) {
      superfinalmark++;
      break;
    }
  for (int i = 0; i < n - 3; i++)
    if (((double)seq2[i + 1] / seq2[i] - (double)seq2[i + 2] / seq2[i + 1]) >
            1e-9 ||
        ((double)seq2[i + 1] / seq2[i] - (double)seq2[i + 2] / seq2[i + 1]) <
            -1e-9) {
      superfinalmark++;
      break;
    }
  for (int i = 0; i < n - 3; i++)
    if (((double)seq3[i + 1] / seq3[i] - (double)seq3[i + 2] / seq3[i + 1]) >
            1e-9 ||
        ((double)seq3[i + 1] / seq3[i] - (double)seq3[i + 2] / seq3[i + 1]) <
            -1e-9) {
      superfinalmark++;
      break;
    }
  if (superfinalmark < 3)
    printf("1\n");
  else
    printf("2\n");
  return 0;
}
