uses crt;
var c,d,e:real;
begin
clrscr;
readln(c,d,e);
writeln((c+d+e)/3:4:2);
readln;
end.
Var a,b,c,tb:real;
Begin
Write('Nhap a = ');readln(a);
Write('Nhap b = ');readln(b);
Write('Nhap c = ');readln(c);
tb:=(a+b+c)/3;
Write('Trung binh cong la ',tb:10:2);
Readln;
End.