#!/usr/bin/env python
import math

rad = int(input("Enter the desired radius: "))

spherevolume = (4/3) * math.pi * math.pow (rad, 3)

#This statement rounds up the total area calculated to 2 decimal point
#Uncomment it to see the magic
#spherevolume = format(spherevolume,'.2f')

print ("The volume of the sphere is therefore: " + str(spherevolume) + ".")