# Arup Guha
# 2/1/2014
# Finding Arc Lengths in a Circle

# Need this to get the value of pi.
import math

# Degrees all around a circle.
WHOLE_CIRCLE = 360

def main():

    # Our initial problem.
    radius = int(input("What is the radius of your circle?\n"))
    angle = int(input("What is the degree measure of the arc you want?\n"))

    # Find the ratio of the circle we are traveling.
    ratio = angle/WHOLE_CIRCLE

    # Use this to calculate how far we go.
    arc_length = ratio*2*math.pi*radius

    # Print out the answer.
    print(arc_length)
    print("The arc length is",arc_length)

main()