Degree of two
Very easy
Execution time limit is 1 second
Runtime memory usage limit is 128 megabytes
n degrees of number 2 are written sequentially in a line, i.e. the numbers from 2 to 2^n
without spaces. Find the value of n.
Input
n (1 ≤ n ≤ 1000) degrees of number 2 are written sequentially in a line.
Output
Print the value of n.
Examples
Input #1
Answer #1
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