var

s,a,n,i,min,max:integer;

begin

min:=32767;

max:=-32768;

readln(n);

for i:=1 to n do

begin

readln(a);

if a<min then min:=a;

if a>max then max:=a;

end;

s:=(min+max)/2;

writeln(s);

end.