#include <bits/stdc++.h>
using namespace std;
const int inf = 1999999999;
const double pi = acos(-1.0);
const double eps = 1e-10;
char gc() {
  char c;
  while (isspace(c = getchar()))
    ;
  return c;
}
vector<int> v;
int test(int a, int b, int i) {
  if (a == 0 && b != 0) return 99999;
  int c = 0;
  int cur = b;
  bool update = true;
  while (i < ((int)(v).size())) {
    if (update && a != 0) {
      cur *= b;
      if ((cur % a) != 0) {
        return c + ((int)(v).size()) - i;
      }
      cur /= a;
      if (cur < -10000 || cur > 10000) {
        return c + ((int)(v).size()) - i;
      }
    }
    if (v[i] != cur) {
      c++;
      update = false;
    } else
      update = true;
    i++;
  }
  return c;
}
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    int t;
    scanf("%d", &t);
    v.push_back(t);
  }
  if (((int)(v).size()) == 1) {
    printf("0");
    return 0;
  }
  if (((int)(v).size()) == 2) {
    if (v[0] != 0)
      printf("0");
    else if (v[1] == 0)
      printf("0");
    else
      printf("1");
    return 0;
  }
  int t = test(v[0], v[1], 2);
  if (t == 0) {
    printf("0");
    return 0;
  }
  if (t == 1) {
    printf("1");
    return 0;
  }
  if (test(v[0], v[2], 3) == 0) {
    printf("1");
    return 0;
  }
  if (test(v[1], v[2], 3) == 0) {
    printf("1");
    return 0;
  }
  printf("2");
}
