Clock Math

#===================================
# Tanzila Islam
# Email: tanzilamohita@gmail.com
# Language: Python 3.7
#===================================

def clockMath(h, m):
	h = h % 12
	h_a = 0.5 * (h*60+m)
	m_a = 6 * m

	angle = abs(h_a - m_a)
	angle = min(360-angle, angle)

	return angle
	
H, M = map(int, input().split())
result = clockMath(H, M)
print(result)