uses crt;
var a:array[1..20]of integer;
i,n,t:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
for i:=1 to n do
write(a[i]:4);
writeln;
t:=0;
for i:=1 to n do
t:=t+a[i];
writeln('Tong cua day la: ',t);
for i:=1 to n do
if a[i]>50 then write(a[i]:4);
writeln;
for i:=1 to n do
if a[i]<30 then write(a[i]:4);
readln;
end.