var
x, y, z, a, c: real;
begin
Read(x, y, z, a);
c := Sqr((x + y - z) / (2 * a));
Write(c)
end.
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Answers & Comments
var
x, y, z, a, c: real;
begin
Read(x, y, z, a);
c := Sqr((x + y - z) / (2 * a));
Write(c)
end.