#include <bits/stdc++.h>
using namespace std;
const int N = 100 + 10;
int n, a[N], res;
int main() {
    while (scanf("%d", &n) && n) {
        res = 0;
        for (int i = 1; i <= n; i++) {
            scanf("%d", &a[i]);
            res ^= a[i];
        }

        if (res == 0)
            puts("0");
        else {
            int ans = 0;
            for (int i = 1; i <= n; i++)
                if ((res ^ a[i]) < a[i]) ans++;
            printf("%d\n", ans);
        }
    }
    return 0;
}