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

using ll = long long;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

    int k,n1;
    cin>>k>>n1;
    vector<vector<int>> V(k);
    vector<vector<int>> M(k);
    V[0].resize(n1, 0);
    M[0].resize(n1, 0);
    for(int i = 1;i < k;i++ ){
        int x;
        cin>>x;
        V[i].resize(x);
        M[i].resize(x, 0);
        for(int j = 0; j < x; j++) {
            cin >> V[i][j]; 
        }
    }
    for(int i=k-1; i>=0;i--) {
        int x = M[i].size();
        for(int j = 0;j < x; j++) {
            if (M[i][j] == 0) M[i][j] +=1;
        
            if(V[i][j] > 0) {
                M[i-1][V[i][j]-1] += M[i][j];
            }
        }

    }
    int result = 0;
    for(int i=0;i<k;i++) {
        int suma = 0;
        int size = M[i].size();
        for(int j=0;j<size;j++) {
            suma += M[i][j];
        }
        result = max(result, suma);
    }
    cout<<result;
}