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#include<bits/stdc++.h>
using namespace std;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
   int k,n,maxi,a,i,j;cin>>k>>n;
   vector<vector<int>>ile(k);
   vector<vector<int>>abc(k);
   ile[0].resize(n,0);
   abc[0].resize(n,0);
   for(i=1;i<k;++i){
       cin>>n;
       ile[i].resize(n,0);
       abc[i].resize(n,0);
       for(j=0;j<n;++j)cin>>ile[i][j];
   }
   maxi=0;
   for(i=k-1;i>0;--i){a=0;
    for(j=0;j<ile[i].size();++j){
    if(abc[i][j]>0){a+=abc[i][j];
    if(ile[i][j]>0)abc[i-1][ile[i][j]-1]+=abc[i][j];
   }
   else {++a;if(ile[i][j]>0)++abc[i-1][ile[i][j]-1];}}
   maxi=max(a,maxi);}
   a=0;
   for(i=0;i<ile[0].size();++i){
       if(abc[0][i]>0)a+=abc[0][i];
       else ++a;
   }
   maxi=max(a,maxi);
   cout<<maxi;
  return 0;
    
}