var
  a : array [1..50,1..50] of longint;
  j,i,sum,n,m : longint;
begin
  for i:=1 to 5 do
    for j:=1 to 5 do
      read(a[i,j]);
  for i:=1 to 5 do
    sum:=sum+a[i,3];
  writeln(sum);
end.