program ideone;
const
N=6;
var
a: array [1..N] of integer;
x, i,y,k: integer;
begin
y:=MaxInt;
for i:= 1 to N do
readln(a[i]);
for i:=1 to N-1 do
begin
x:=a[i]+a[i+1];
if (x mod 2 <> 0) and (x < y) then
y := x;
end;
writeln(y)
end.
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