#! /usr/bin/env python3
"""
pe2.py
https://mind.kittttttan.info/py/pe2.html
"""
def pe2(limit=4000000):
"""
By considering the terms in the Fibonacci sequence
whose values do not exceed four million,
find the sum of the even-valued terms.
"""
a,b,s = 1,2,2
while b <= limit:
a, b = b, a + b
if not b & 1:
s += b
print(s)
if __name__ == "__main__":
pe2()