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#include <bits/stdc++.h>
using ll = long long;
using sz = size_t;
using namespace std;

// make the code less c++-readable:
template<class T> using v = vector<T>; 
template<class T> using vv = v<v<T>>; 
using vi = v<int>; using vll = v<ll>; using vvi = vv<int>; using vvll = vv<ll>;

// hai loading utilities
#define $T template<class T>
#define $Ts template<class... T>
$T T Load() { T v; cin >> v; return v; }
$T auto Loads(int n) { v<T> v; v.reserve(n); while(n--) v.emplace_back(Load<T>()); return v; }
$T auto Loads() { return Loads<T>(Load<int>()); }
template<class T, int N> auto Loada() { array<T, N> a; for (T& v: a) v = Load<T>(); return a; }
$Ts auto Cols(int rows) { tuple<v<T>...> t; while(rows--) [&]<sz... I>(index_sequence<I...>){(std::get<I>(t).push_back(Load<T>()), ...);}(index_sequence_for<T...>{}); return t; }
//$Ts auto Rows(int rows) { v<tuple<T...>> v; while(rows--) { v.emplace_back(Load<T>()...); } return v; } bugged :(
struct _aIV { $T operator vector<T>() { return Loads<T>(n); } sz n; };
struct _aI { $T operator T() { return Load<T>(); } _aIV operator()(sz n) { return {n}; } }; static inline _aI $;  /* int N = $;  vi Y = $(N); */
#define MAKE_LOADER(T, alias) \
  T alias() { return Load<T>(); }   /* int x = Int(); */\
  auto alias##s() { return Loads<T>(); }   /* vector<> xs = Ints(); */\
  auto alias##s(int n) { return Loads<T>(n); }   /* vector<> xs = Ints(7); */\
  template<int N> auto alias##a() { return Loada<T, N>(); }   /* array<> xs = Inta<7>();  */\
// line intentionally left blank
MAKE_LOADER(int, Int)
MAKE_LOADER(long long, LL)
MAKE_LOADER(char, Char)
MAKE_LOADER(string, String)
// kthxbye


void test() {
	int k = $;
    vvi S;
    S.push_back(vi(Int()));

    for (int d = 1; d < k; ++d) {
        int n = $;
        S.push_back(Ints(n));
    }

    int ans = 0;

    vi alok, nalok;
    alok.resize(S[k-1].size());
    for (int d = k-1; d>=0; --d) {
        nalok.clear();
        if (d) nalok.resize(S[d-1].size());

        int dans = 0;
        for (int i = 0; i < alok.size(); ++i) {
            alok[i] = max(1, alok[i]);
            dans += alok[i];

            if (d && S[d][i]) {
                nalok[S[d][i]-1] += alok[i];
            }
        }
        ans = max(ans, dans);

        swap(alok, nalok);
    }

    cout << ans << endl;
}


[[maybe_unused]] void jeden_test() { test(); }
[[maybe_unused]] void wiele_test() { int T = $; while (T--) test(); }

int main() {
    jeden_test();
    return 0;
}