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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define FOR(i,a,b) for(__typeof(b) i = a; i < b; ++i)
#define FORev(i,a,b) for(__typeof(a) i = a; i >= b; --i)
#define pb push_back
#define c(x) cin >> x

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    ll k,n; c(k); c(n);
    vector<vector<ll>> t(k+1);
    vector<ll> cnt(k+1);
    cnt[1] = n;
    FOR(i,2,k+1){
        ll ni; c(ni);
        cnt[i] = ni;
        t[i].resize(ni);
        FOR(j,0,ni){
            ll x; c(x);
            t[i][j] = x;
        }
    }

    ll res = cnt[k];
    vector<ll> prev(cnt[k],1);
    FORev(i,k,2){
        vector<ll> cur(cnt[i-1]);
        FOR(j,0,cnt[i]){
            ll x = t[i][j];
            if (x > 0) 
                cur[x-1] += prev[j];
        }

        ll used = 0;
        FOR(j,0,cnt[i-1]){
            if (cur[j] == 0) cur[j] = 1;
            used += cur[j];
        }

        res = max(res,used);
        prev.swap(cur);
    }

    cout << res << "\n";
}