var a,b:integer;
c:real;
begin
readln(a, b)
c = (a * b) * 0,5
write(c:0:0)
end.
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Answers & Comments
var a,b:integer;
c:real;
begin
readln(a, b)
c = (a * b) * 0,5
write(c:0:0)
end.