Fox Observation

map<pair<int, int>, int> mp;

int main()
{
    int n, x, y, v;
    while (~RI(n))
    {
        REP(kase, n)
        {
            RIII(x, y, v);
            mp[MP(x, y)] += v;
            mp[MP(x - 1, y)] += v;
            mp[MP(x, y - 1)] += v;
            mp[MP(x - 1, y - 1)] += v;
        }
        int ans = 0;
        FC(it, mp)
        {
            ans = max(ans, it->second);
        }
        printf("%d / 1\n", ans);
    }
    return 0;
}