uses crt;
var a:array[1..100]of integer;
n,i,t,nn,kt:integer;
begin
clrscr;
readln(n);
for i:=1 to n do readln(a[i]);
t:=1;
for i:=1 to n do
if a[i] mod 3=0 then t:=t*a[i];
writeln(t);
kt:=0;
nn:=32567;
for i:=1 to n do
if a[i] mod 3=0 then
begin
if nn>a[i] then nn:=a[i];
kt:=1;
end;
if kt=0 then writeln('Khong co so chia het cho 3')
else writeln('So nho nhat chia het cho 3 la: ',nn);
for i:=1 to n do
if nn=a[i] then write(i:4);
writeln;
for i:=n downto 1 do
write(a[i]:4);
readln;
end.