program oken;
uses crt;
var a: array [1..100] of integer;
i,n,dem,dem2:integer;
tong,s1,s2:real;
begin
clrscr;
write('nhap so phan tu cua mang: '); readln(n);
for i:=1 to n do
begin
write('a[',i,']: '); readln(a[i]);
end;
dem:=0; dem2:=0;
for i:=1 to n do
begin
if a[i]>0 then
begin
s1:=s1+a[i];
dem:=dem+1;
end
else
if a[i]<0 then
begin
s2:=s2+a[i];
dem2:=dem2+1;
end;
tong:=tong+a[i];
end;
writeln('trung binh cong cua mang: ',tong/n:0:3);
writeln('trung binh cong cua phan tu duong: ',s1/dem:0:3);
if dem2<>0 then writeln('trung binh cong cua phan tu am: ',s2/dem2:0:3);
readln;
end.
