program mang;
uses crt;
var X:array [1..500] of real;
n,i: integer;
T: real;
Begin
clrscr;
write('Nhap so phan tu: '); readln(n);
for i:=1 to n do
begin
write('X[',i,']='); readln(X[i]);
T:=T+X[i];
end;
write('Trung binh cong cac so thuc = ',T/n:2:2);
readln
End.