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

#define pll pair<long long, long long>
#define pii pair<int,int>
#define px first
#define py second
#define ll long long
#define eb emplace_back
#define vc vector

struct _debugger{
    void LGdebug(vector<vector<ll>> &g){
        cout << "GRAPH IS:\n";
        for(unsigned ll i=0; i<g.size(); i++){
            cout << i <<": ";
            for(auto c: g[i]) cout << c << " ";
            cout << "\n";
        }
        cout << "----------\n";
    }
    void LWGdebug(vector<vector<pll>> &g){
        cout << "WEIGHTED GRAPH IS:\n";
        for(unsigned ll i=0; i<g.size(); i++){
            cout << i <<": ";
            for(auto c: g[i]) cout << "{x: " << c.px << ", y: " << c.py << "} ";
            cout << "\n";
        }
        cout << "----------\n";
    }
    void LVdebug(vector<ll> &v ){
        cout << "VECTOR IS: " << "\n";
        for(unsigned ll i=0; i<v.size(); i++) cout << i << ": " << v[i] << "\n";
        cout << "---------\n";
    }
    void Gdebug(vector<vector<int>> &g){
        cout << "GRAPH IS:\n";
        for(unsigned ll i=0; i<g.size(); i++){
            cout << i <<": ";
            for(auto c: g[i]) cout << c << " ";
            cout << "\n";
        }
        cout << "----------\n";
    }
    void WGdebug(vector<vector<pii>> &g){
        cout << "WEIGHTED GRAPH IS:\n";
        for(unsigned ll i=0; i<g.size(); i++){
            cout << i <<": ";
            for(auto c: g[i]) cout << "{x: " << c.px << ", y: " << c.py << "} ";
            cout << "\n";
        }
        cout << "----------\n";
    }
    void Vdebug(vector<int> &v ){
        cout << "VECTOR IS: " << "\n";
        for(unsigned ll i=0; i<v.size(); i++) cout << i << ": " << v[i] << "\n";
        cout << "---------\n";
    }
    void VPdebug(vector<pii> &v ){
        cout << "VECTOR IS: " << "\n";
        for(unsigned ll i=0; i<v.size(); i++) cout << i <<": " << "{x: " << v[i].px << ", y: " << v[i].py << "} \n";
        cout << "---------\n";
    }
};

_debugger deBug;
const ll linf = 4e18;   
const int inf = 1e9;
const int NN = 1e5+67;



void solve(){
  

    int n, k;
    cin >> k >> n;

    vector<vector<pll>> tab(2, vector<pll> (n+1, {0,0}));

    for(int u=2; u<=k; u++){
        int nn;
        cin >> nn;
        tab.eb(vector<pll> (nn+1, {0,0}));
        for(int i=1; i<=nn; i++) cin >> tab[u][i].px;
    }

    ll res = 0;



    for(int u=k; u>0; --u){
        ll cur = 0;
        int i=0;
        for(auto [pt, val]: tab[u]){
            if(i==0){
                i++;
                continue;
            }
            cur += max(val, 1LL);

            if(pt>0){
                tab[u-1][pt].py+=max(val, 1LL);
            }
            i++;
        }
        res = max(res, cur);
    }






    cout << res;
}




signed main(){
    cin.tie(0) -> sync_with_stdio(0);
    //int t; cin >> t; 
    //while(t--)
        solve();
    return 0;
}