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Error: Error: must not create an existing file {"type":"CREATE_FILE","wid":"0.011808728754344688","path":"main.py","file":{"path":"main.py","content":{"asEncoding":{"base64":"cywgeCwgeSA9IDAsIDAsIDIKTCA9IGludChpbnB1dCgnU3VtIG9mIGV2ZW4gRmlib25hY2NpIG51bWJlcnMgPCcpKQp3aGlsZSB5IDwgTDoKICAgIHMsIHgsIHkgPSBzK3ksIHksIDQqeSt4CnByaW50ICJpcyIsIHM="},"asBuffer":null},"loaded":true}}
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s, x, y = 0, 0, 2
L = int(input('Sum of even Fibonacci numbers <'))
while y < L:
    s, x, y = s+y, y, 4*y+x
print "is", s