#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>
#include <atcoder/mincostflow>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

const ll INF = 1e18;

struct edge{
    int to;
    ll cap, cost;
    int rev;
};

class MinCostFlow{
    public:
        int V;  // 頂点数
        vector<vector<edge>> G;
        MinCostFlow(int v){
            V = v;
            G = vector<vector<edge>>(v, vector<edge>());
            dist = vector<ll>(v);
            preve = vector<int>(v);
            prevv = vector<int>(v);
        }
        void add_edge(int from, int to, ll cap, ll cost){
            G[from].push_back((edge){to, cap, cost, G[to].size()});
            G[to].push_back((edge){from, 0, -cost, G[from].size()-1});
        }

        ll min_cost_flow(int s, int t, int f){
            ll res = 0;
            while(f > 0){
                fill(dist.begin(), dist.end(), INF);
                dist[s] = 0;
                bool update = true;
                while(update){
                    update = false;
                    for(int v = 0; v < V; v++){
                        if(dist[v] == INF) continue;
                        for(int i = 0; i < G[v].size(); i++){
                            edge &e = G[v][i];
                            if(e.cap > 0 && dist[e.to] > dist[v]+e.cost){
                                dist[e.to] = dist[v]+e.cost;
                                prevv[e.to] = v;
                                preve[e.to] = i;
                                update = true;
                            }
                        }
                    }
                }
                if(dist[t] == INF){
                    return -1;
                }
                ll d = f;
                for(int v = t; v != s; v = prevv[v]){
                    d = min(d, G[prevv[v]][preve[v]].cap);
                }
                f -= d;
                res += d*dist[t];
                for(int v = t; v != s; v = prevv[v]){
                    edge &e = G[prevv[v]][preve[v]];
                    e.cap -= d;
                    G[v][e.rev].cap += d;
                }
            }
            return res;
        }

    private:
        vector<ll> dist;
        vector<int> prevv, preve;
};


int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int n, k; cin >> n >> k;
    vector<int> a(n), m(n);
    vector<vector<int>> b(n);
    for(int i = 0; i < n; i++){
        cin >> a[i] >> m[i];
        b[i].resize(m[i]);
        for(int j = 0; j < m[i]; j++) {
            cin >> b[i][j];
            b[i][j]--;
        }
    }
    auto mcf = atcoder::mcf_graph<ll,ll>(2*n+2);
    int s = 0, t = 2*n+1;
    auto s_idx = [&](int i){
        return i*2+1;
    };
    auto t_idx = [&](int i){
        return i*2+2;
    };
    mcf.add_edge(s, s_idx(0), k, 0);
    mcf.add_edge(t_idx(n-1), t, k, 0);
    const ll inf = 1e10;
    for(int i = 0; i < n; i++){
        mcf.add_edge(s_idx(i), t_idx(i), k, 0);
        for(int j: b[i]) {
            mcf.add_edge(t_idx(j), s_idx(i), 1, inf*(i-j)+a[j]-a[i]);
        }
        if(i != 0){
            mcf.add_edge(t_idx(i-1), s_idx(i), k, inf);
        }
    }
    auto [_, cost] = mcf.flow(s, t, k);
    
    cout << inf*(n-1)*k-cost << endl;
}