Var a:array[1..200] of integer;
i,n,s,dem:integer;
tbc:real;
Begin
Write('Nhap so luong phan tu = ');readln(n);
For i:=1 to n do
Begin
Write('Nhap phan tu thu ',i,' = ');readln(a[i]);
End;
s:=0;
For i:=1 to n do
If a[i] mod 2 = 0 then
Begin
s:=s+a[i];
dem:=dem+1;
End;
tbc:=s/dem;
Write('Trung binh cong cac so chan la ',s:10:2);
Readln;
End.