Problems
How many Fibonacci numbers
How many Fibonacci numbers
Fibonacci sequence is a sequence where each element equals to the sum of two previous ones, except for the first two elements: F1
= 1, F2
= 1, Fn
= Fn-2
+ Fn-1
.
1 1 2 3 5 8 13 21 ...
Given array of integers. How many Fibonacci numbers are there?
Input
The first line contains the amount k of input numbers. The next line contains k integers a1
, a2
, ..., ak
(0 < k ≤ 1000, 0 ≤ ai
< 263
).
Output
Print a single number - how many Fibonacci numbers in the given array of integers.
Input example #1
5 1 3 5 6 13
Output example #1
4