from math import pi
k1 = 1.4
k2 = 3.0
a = 6.3e-2
b = 12.2e-2
c = 19.7e-2
x = 9e-12
numerador = k1 * k2 * a * b * c * (4 * pi * x)
denominador = (k2 * b * c) - (k1 * a * b) + (a * c * (k1 - k2))
C = numerador / denominador
print(C)
ZnJvbSBtYXRoIGltcG9ydCBwaQoKazEgPSAxLjQKazIgPSAzLjAKYSA9IDYuM2UtMgpiID0gMTIuMmUtMgpjID0gMTkuN2UtMgp4ID0gOWUtMTIKCm51bWVyYWRvciA9IGsxICogazIgKiBhICogYiAqIGMgKiAoNCAqIHBpICogeCkKZGVub21pbmFkb3IgPSAoazIgKiBiICogYykgLSAoazEgKiBhICogYikgKyAoYSAqIGMgKiAoazEgLSBrMikpCgpDID0gbnVtZXJhZG9yIC8gZGVub21pbmFkb3IKcHJpbnQoQykK