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#include <iostream>
#include <vector>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int k, n1;
    cin >> k >> n1;

    int res = 0;
	vector <vector <int>> v1(k);
	vector <vector <int>> v2(k);
	v1[0].resize(n1, 0);
	v2[0].resize(n1, 1);
	
	for(int i=1; i<k; i++) {
		int n;
		cin >> n;
		for(int j=0; j<n; j++) {
			int a;
			cin >> a;
			v1[i].push_back(a);
			v2[i].push_back(1);
		}
	}
	
	for(int i=k-1; i>=0; i--) {
		int s = v2[i].size();
		int curr = 0;
		// cout << "i = " << i << ", s = " << s << '\n';
		for(int j=0; j<s; j++) {
			int pre = v1[i][j];
			int val = v2[i][j];
			if(val > 1) {
				val--;
			}
			curr += val;
			if(pre > 0) {
				v2[i-1][pre-1] += val;
			}
			// cout << "j = " << j << ", pre = " << pre << ", val = " << val << '\n';
		}
		if(curr > res) {
			// cout << "updating res; prev res = " << res << "; new res = " << curr << '\n'; 
			res = curr;
		}
	}
	
    cout << res;

    return 0;
}