#include <bits/stdc++.h>
using namespace std;
bool Equal(double a, double b) {
  if (abs(a - b) < 1e-9) return true;
  return false;
}
int n;
int a[100002];
bool Valid(int num, int den) {
  if (den != 0)
    return true;
  else if (num == 0)
    return true;
  return false;
}
double getFrac(double b, double num, double den) {
  if (den == 0)
    return 0;
  else
    return b * num / den;
}
int evalArr() {
  int num, den;
  int dels;
  den = a[0];
  num = a[1];
  if (Valid(num, den)) {
    dels = 0;
    for (int i = 1; i < n - 1; i++) {
      double next = getFrac(a[i], num, den);
      while (!Equal(next, a[i + 1])) {
        dels++;
        i++;
        if (dels > 1 || i >= n - 1) break;
      }
    }
    if (dels == 0) return 0;
    if (dels == 1) return 1;
  }
  num = a[2];
  if (Valid(num, den)) {
    dels = 0;
    for (int i = 2; i < n - 1; i++) {
      double next = getFrac(a[i], num, den);
      while (!Equal(next, a[i + 1])) {
        dels++;
        break;
      }
    }
    if (dels == 0) return 1;
  }
  den = a[1];
  num = a[2];
  if (Valid(num, den)) {
    dels = 0;
    for (int i = 2; i < n - 1; i++) {
      double next = getFrac(a[i], num, den);
      while (!Equal(next, a[i + 1])) {
        dels++;
        break;
      }
    }
    if (dels == 0) return 1;
  }
  return 2;
}
int main() {
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  int val = evalArr();
  cout << val << endl;
  return 0;
}
