Person in Charge

• cq_irritater
• 035966_L3

Problem Description

Calculate $\lfloor\lg n\rfloor$.

Input Format

A positive integer $n$.

Output Format

A non-negative integer $\lfloor\lg n\rfloor$.

Samples

2940514964

9

Data Range

$0<n<10^{10^8}$.

$\lg n=\log _{10} n$.