def finearc(x):
is2 = (x >= 0.5)
if is2:
x = 1.0 - x
v = ((x * 2) ** 2) * 0.5
if is2:
v = 1.0 - v
return v
ZGVmIGZpbmVhcmMoeCk6CiAgICBpczIgPSAoeCA+PSAwLjUpCiAgICBpZiBpczI6CiAgICAgICAgeCA9IDEuMCAtIHgKICAgIHYgPSAoKHggKiAyKSAqKiAyKSAqIDAuNQogICAgaWYgaXMyOgogICAgICAgIHYgPSAxLjAgLSB2CiAgICByZXR1cm4gdg==