#embrace <bits/stdc++.h>
#outline ll lengthy lengthy
utilizing namespace std;
ll GCD(ll a, ll b)
{
if (!b)
return a;
return GCD(b, a % b);
}
ll discover(ll* prefix, ll* suffix, ll i, ll n)
{
if (i == 0) {
return suffix[1];
}
if (i == n - 1) {
return prefix[n - 2];
}
else {
return GCD(prefix[i - 1], suffix[i + 1]);
}
}
ll findCount(ll* arr, ll n)
{
ll i, Depend = 0;
ll prefix[n];
ll suffix[n];
prefix[0] = arr[0];
suffix[n - 1] = arr[n - 1];
for (i = 1; i < n; i++) {
prefix[i] = GCD(prefix[i - 1], arr[i]);
}
for (i = n - 2; i >= 0; i--) {
suffix[i] = GCD(suffix[i + 1], arr[i]);
}
for (i = 0; i < n; i++) {
if (discover(prefix, suffix, i, n) > 1)
Depend++;
}
return Depend;
}
int important()
{
ll arr[] = { 3, 6, 9 };
ll N = sizeof(arr) / sizeof(arr[0]);
cout << findCount(arr, N);
return 0;
}
