const fi='mang.txt';
fo='kqua.txt';
var f1,f2:text;
a:array[1..100]of integer;
i,dem,t:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
dem:=0;
while not eoln(f1) do
begin
inc(dem);
read(f1,a[dem]);
end;
t:=0;
for i:=1 to dem do
if a[i] mod 2=0 then t:=t+a[i];
writeln(f2,t);
close(f1);
close(f2);
end.