#include<iostream>
#include<cstdio>
using namespace std; int main()
{
int n,k[1005];
int sum,cnt;
while(scanf("%d",&n)&&n)
{
sum=0,cnt=0;
for(int i=1;i<=n;i++)
{
scanf("%d",&k[i]);
sum^=k[i];
}
if(sum==0)
{
printf("0\n");
continue;
}
for(int i=1;i<=n;i++)
if(k[i]>=(sum^k[i])) //sum^k[i]要加括号(),不然会WA
cnt++;
printf("%d\n",cnt);
}
return 0;
}