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#include <iostream>
#include <vector>

using namespace std;

int main()
{
    cin.tie(0)->sync_with_stdio();
    int k;
    cin>>k;
    vector<vector<int>> vec(k);
    vector<vector<int>> vec2(k);
    int res = 0;
    {
        int n1;
        cin>>n1;
        vec[0].resize(n1);
        vec2[0].resize(n1);
    }
    for(int i=1; i<k; i++) {
        int nc;
        cin>>nc;
        vec[i].resize(nc);
        vec2[i].resize(nc);
        for(auto& x : vec[i])
            cin>>x;
    }
    for(int i=k-1; i>=0; i--) {
        int cnt = 0;
        for(auto& x : vec2[i]) {
            x = max(x, 1);
            cnt += x;
        }
        for(int j=0; j<vec[i].size(); j++) {
            int x = vec[i][j];
            if(x > 0) {
                vec2[i-1][x-1] += vec2[i][j];
            }
        }
        res = max(res, cnt);
    }
    cout<<res<<"\n";
}