#include <iostream>

#pragma GCC optimize("O3")

using namespace std;

int a[100000];

int count(int s,int e,int b)
{
  int u1=0,u2=0,m=~(b*2-1);
  int i=s,j=e;
  while ( i<=j )
  {
    while ( i<=j&&!(a[i]&b) )
      u1|=a[i++]&m;
    while ( i<=j&& (a[j]&b) )
      u2|=a[j--]&m;
    if ( i<j )
    {
      int t=a[i];
      a[i]=a[j];
      a[j]=t;
    }
  }
  int c;
  c= j<s  ? 0 :
     j==s ? 1 :
     u1   ? count(s,j,b*2) :
            0;
  c+=i>e  ? 0 :
     i==e ? 1 :
     u2   ? count(i,e,b*2) :
            0;
  return c;
}
int main(void)
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin>>n;
  int i=-1,j=n;
  while ( i+1<j )
  {
    int x;
    cin>>x;
    a[x&1?--j:++i]=x;
  }
  int c=count(0,i,2);
  c+=count(j,n-1,2);
  cout<<c;
}