r, o, m, h = [float(i) for i in input('Введите значения r, o, m, h через пробел: ').split()]
def func(r, o, m, h):
	pi = 3.14
	G = 6.67e-11
	F = (pi * (r ** (o * G * m))) / h
	return F
print(func(r, o, m, h))