uses crt;
var
a, b: integer;
s: real;
begin clrscr;
wtite('a=');
read(a);
write('b=');
read(b);
s:=(a+b)/2;
writeln('s=', s:4:3);
readkey;
end.
uses crt;
var
a, b: integer;
s: real;
begin clrscr;
wtite('a=');
read(a);
write('b=');
read(b);
s:=(a+b)/2;
writeln('s=', s:4:3);
readkey;
end.