#include <bits/stdc++.h>

using namespace std;

int main() {
    // std::ios_base::sync_with_stdio(false);
    // std::cin.tie(NULL);
    
    int n,m;
    cin>>n>>m;

    int garbage;
    vector<vector<int>> graf,answer;
    graf.assign(n,{});
    graf[0].assign(m,0);
    answer.assign(n,{});
    answer[0].assign(m,0);
    int pom;
    
    for(int i=1;i<n;i++) {
        cin>>garbage;
        answer[i].assign(garbage,0);
        for(int j=0;j<garbage;j++) {
            cin>>pom;
            graf[i].emplace_back(pom);
        }
    }
    
    int mini=INT_MAX;
    
    int act=0;
    
    for(int i=n-1;i>=0;i--) {
        for(int j=0;j<graf[i].size();j++) {
            int val = graf[i][j];
            if(answer[i][j] == 0) {
                answer[i][j] = 1;
            }

            if(val!=0) {
                answer[i-1][val-1]+=answer[i][j];
            }
        }
    }

    for(int i=n-1;i>=0;i--) {
        act = 0;
        for(int j=0;j<graf[i].size();j++) {
            act+=answer[i][j];
        }
        mini=min(mini,act);
    }
    cout<<act;


    
    return 0;
}