program trung_binh;
uses crt;
var A:array[1..1000] of real;
n,i:integer;
t:real;
begin
clrscr;
write('Nhap n: '); readln(n);
i:=0; t:=0;
while i<n do
begin
i:=i+1;
write('Nhap so thu ',i,': '); readln(A[i]);
t:=t+A[i];
end;
write('Tong cua cac so thuc la: ',t/n:0:3);
readln;
end.