import std.stdio, std.conv, std.string, std.bigint;
import std.math, std.random, std.datetime;
import std.array, std.range, std.algorithm, std.container;
string read(){ static string[] ss; while(!ss.length) ss = readln.chomp.split; string res = ss[0]; ss.popFront; return res; }

void main(){
	int d = read.to!int;
	string w = ".";
	foreach(i; 1 .. 1000){
		w ~= i.to!string;
	}
	w[d].writeln;
}