Productive Math Class

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Points: 5
Time limit: 1.0s
Memory limit: 64M

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Problem type

Today in period 8/9 math, Jerry decided to distract Mr. Ing by writing down every single natural number in the entire known universe in ascending order (it was a very long class). He's also forgotten to put some commas, and he needs your help in determining the N^\text{th} digit in his sequence (1 \le N \le 10^9). Could you be a dear and help Jerry out?

Input Specification

A single integer N (1 \le N \le 10^9).

Output Specification

The N^\text{th} digit in the sequence of all natural numbers.

Sample Input 1

17

Sample Output 1

3

Sample Input 2

2034525

Sample Output 2

5

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