CodeForces 672A Summer Camp

思路：水题

#include<bits\stdc++.h>
using namespace std;

int main()
{
string s = "";
int i = 1;
while(s.size()<1000)
{
string s1 = "";
int temp = i;
while(temp)
{
s1+=(temp%10+'0');
temp/=10;
}
reverse(s1.begin(),s1.end());
s+=s1;
i++;
}
int n;
scanf("%d",&n);
printf("%c\n",s[n-1]);

}

Description

Every year, hundreds of people come to summer camps, they learn new algorithms and solve hard problems.

This is your first year at summer camp, and you are asked to solve the following problem. All integers starting with 1 are written in one line. The prefix of these line is "123456789101112131415...".
Your task is to print the n-th digit of this string (digits are numbered starting with 1.

Input

The only line of the input contains a single integer n (1 ≤ n ≤ 1000) — the position of the digit you need to print.

Output

Print the n-th digit of the line.

Sample Input

Input

3

Output

3

Input

11

Output

0