var

 a, b, c, d, k: longint;

begin

 read(a, b, c, d);

 k := 0;

 if a mod 2 = 0 then k := k + 1;

 if b mod 2 = 0 then k := k + 1;

 if c mod 2 = 0 then k := k + 1;

 if d mod 2 = 0 then k := k + 1;

 writeln(k);

end.