import math
 
def main():
 
    print("Welcome to Pi approximation!\n")
 
    n = 10000
 
    approx = 0
 
    for i in range(1, n+1, 4):
        approx += 4 / i - 4 / (i+2)
 
    print("Approximate value of pi is: " + str(approx))
 
    print("Deviation from Pi is: " + str(math.pi - approx))
 
main()