a = b = 1
c = int(input("Номер элемента ряда Фибоначчи: "))
d = 0
while d < c -2:
e = a + b
a = b
b = e
d = d + 1
print(d)
YSA9IGIgPSAxCmMgPSBpbnQoaW5wdXQoItCd0L7QvNC10YAg0Y3Qu9C10LzQtdC90YLQsCDRgNGP0LTQsCDQpNC40LHQvtC90LDRh9GH0Lg6ICIpKQpkID0gMAp3aGlsZSBkIDwgYyAtMjoKCWUgPSBhICsgYgoJYSA9IGIKCWIgPSBlCglkID0gZCArIDEKCQpwcmludChkKQ==