uses crt;
var a:array[1..100]of integer;
i,n,t,j,tam:integer;
begin
clrscr;
readln(n);
for i:=1 to n do readln(a[i]);
for i:=1 to n do write(a[i]:5);
writeln;
writeln('Cac so duong la: ');
for i:=1 to n do if (a[i]>0) then write(a[i]:4);
writeln;
t:=0;
for i:=1 to n do
if a[i] mod 3=0 then t:=t+a[i];
writeln(t);
for i:=1 to n-1 do
for j:=i+1 to n do
if a[i]<a[j] then
begin
tam:=a[i];
a[i]:=a[j];
a[j]:=tam;
end;
for i:=1 to n do write(a[i]:4);
readln;
end.