program tinh_trung_binh_cong;
uses crt;
var i,n,max,min:integer
tbc:real;
a:array[1..100]of integer;
begin
clrscr;
write('nhap n:');readln(n);
for i;=1 to n do
begin
write('a[',i,']=');readln(a[i]);
end;
max:=a[1];min:=a[1];
for i;1= to n do
begin
if max<a[i] then max:=a[i];
if min>a[i] then min:=a[i];
end;
tbc:=(max+min)/2;
writeln(tbc);
readln;
end
uses crt;
var a:array[1..100]of integer;
i,n,max,min:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
max:=a[1];
min:=a[1];
for i:=1 to n do
begin
if max<a[i] then max:=a[i];
if min>a[i] then min:=a[i];
end;
writeln((max+min)/2:4:2);
readln;
end.