#include <bits/stdc++.h>
using namespace std;
int main(){
    int N, K;
    cin >> N >> K;
    vector<long long> 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]--;
        }
    }
    vector<vector<long long>> dp(N, vector<long long>(2));
    dp[0][0] = 0;
    dp[0][1] = -A[0];
    for(int i = 1; i < N; i++){
        for(int j = 0; j < M[i]; j++){
            dp[i][0] = max(dp[i][0], A[i] + dp[B[i][j]][1]);
            dp[i][0] = max(dp[i][0], dp[i - 1][0]);
        }
        dp[i][1] = dp[i][0] - A[i];
    }
    cout << dp[N - 1][0] << endl;
}