#include <iostream>
using namespace std;
typedef long long ll;

int main()
{
    int n, k;
    cin >> n >> k;
    ll dp[100005]{0};
    ll ans = 0;
    for(int i = 0; i < n; i++){
        ll a;
        int m;
        cin >> a >> m;
        for(int j = 0; j < m; j++){
            int b;
            cin >> b;
            b--;
            ans = max(ans, dp[b] + a);
        }
        dp[i] = ans - a;
    }
    cout << ans << endl;
}