program plot;
var
i,j,n,d,suma,liczba:integer;
min:longint;
Begin
readln(d);
min:=100001; {o 1 wiecej niz maks}
for i:=1 to d do
begin
read(n);
suma:=0;
for j:=1 to n do
begin
read(liczba);
suma:=suma+liczba;
end;
if suma < min then
min:=suma;
end;
writeln(min);
end.
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