program ct;
uses crt;
var i,n,tong,sochan,s,max:integer;
A:array[1..100] of integer;
begin
clrscr;
write('nhap so phan tu:=');readln(n);
for i:=1 to n do
begin
write('nhap mang a[',i,']:=');readln(a[i]);
end;
(3)
tong:=0;
for i:=1 to n do
if a[i] >0 then tong:=tong+a[i];
writeln('tong cac so duong',tong);
(4)
sochan:=0;
if a[i] mod 2=0 then sochan:=sochan+a[i];
writeln('tong cac so chan la',sochan);
(5)
s:=0;
for i:=1 to n do
if a[i] mod 5=0 then s:=s+a[i];
write('tong cac phan tu chia het cho 5 la',s);
(6)
max:=a[1];
for i:=2 to n do
if max<[i] them max:=a[i];
writeln('phan tu lon nha la',max);
readln
end.