uses crt;
var b:array[1..50]of integer;
i,n,t:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('B[',i,']='); readln(b[i]);
end;
t:=0;
for i:=1 to n do
t:=t+b[i];
writeln('Gia tri trung binh cua day la: ',t/n:4:2);
readln;
end.