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#include<bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (int i = (a); i < (b); i++)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define ST first
#define ND second
#define PB push_back
using ll = long long;
using ld = long double;
using pi = pair<int,int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;


#ifdef LOCAL
#define DTP(x, y)                                    \
    auto operator<<(auto &o, auto a)->decltype(y, o) \
    {                                                \
        o << "(";                                    \
        x;                                           \
        return o << ")";                             \
    }
DTP(o << a.first << ", " << a.second, a.second);
DTP(for (auto i : a) o << i << ", ", all(a));
void dump(auto... x) { ((cerr << x << ", "), ...) << '\n'; }
#define debug(x...) cerr << setw(4) << __LINE__ << ":[" #x "]: ", dump(x)
#else
#define debug(...) 0
#endif



void Solve()
{
    int k;
    cin >> k;
    vector<vector<pi>> D(k);
    rep(i, 0, k){
        int n;
        cin >> n;
        D[i].resize(n, pi(i, 1));
        if(i>0){
            rep(j, 0, n){
                int a;
                cin >> a;
                if(a>0){
                    D[i][j].ST=D[i-1][--a].ST;
                    D[i-1][a].ND=0;
                }
            }
        }
    }
    vi P(k+1);
    rep(i, 0, k)
        for(auto &[x,y]: D[i])
            if(y){
                ++P[x];
                --P[i+1];
            }
    int res=0;
    rep(i, 0, k){
        if(i)
            P[i]+=P[i-1];
        if(P[i]>res)
            res=P[i];
    }
    cout << res << "\n";
    return;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int t=1;
    // cin >> t;
    while(t--)
    {
        Solve();
    }
    return 0;
}