import math

print("Tooth count: ")
gearToothCount = int(input())
print("Module (mm):")
gearModule = float(input())
# print("lead (axial advance per revolution, mm):")
# gearLead = input()
print("Desired angle:")
gearAngle = float(input())

# angle = math.degrees(math.atan((math.pi*gearModule*gearToothCount)/gearLead))

lead = (math.pi*gearModule)/math.tan(math.radians(gearAngle))

# print("Angle" + angle)
print("Lead (mm): ", lead)