#include <stdio.h>

int main() {
    int t;
    scanf("%d", &t);

    while (t--) {
        int n;
        scanf("%d", &n);

        int pos = 0, neg = 0, zero = 0;
        for (int i = 0; i < n; i++) {
            int ele;
            scanf("%d", &ele);
            if (ele == 1) pos++;
            else if (ele == -1) neg++;
            else if (ele == 0) zero++;
        }

        int score = 0;
        score += pos / 3;
        pos %= 3;

        while (pos > 0 && neg >= 2) {
            score++;
            pos--;
            neg -= 2;
        }

        score += neg / 3;

        printf("%d\n", score);
    }
    
    return 0;
}