program ct;
uses crt;
var s,n,i:integer;
A:array[1..150] of integer;
begin
clrscr;
write('nhap n=');readln(n);
for i:=1 to n do
begin
write('nhap mang A[',i,']=');readln(A[i]);
end;
s:=0;
for i:=1 to n do
if A[i] mod 3=0 then s:=s+A[i];
writeln('tong cac so chia het cho 3 la=',s);
readln
end.