const
    N = 5;
    
var
    a : array[1..N, 1..N] of integer;
    sum : integer;
    i, j : integer;
    
begin
    sum := 0;
    for i := 1 to N do
        for j := 1 to N do begin
            readln(a[i,j]);
            if i = j then
                sum += a[i,j];
            if i + j = 6 then
                sum += a[i,j];
        end;
    writeln('Summa is ', sum);
end.