a = 0
A = 13591409
B = 545140134
C = 640320

for k in range(0,100):
    top = -1^k*fact(6*k)*(A+B*k)
    bottom = fact(3*k)*fact(k)^3*C^(3*k+3/2)
    a = a + top/bottom
    print "a: ", a
    print "top:", top
    print "bottom:", bottom

print "pi:", 1 / ( 12 * a)