#include <stdio.h>
#include <string.h>
#include <math.h>

void uint2str(char str[], size_t len, double num) {
    snprintf(str, len, "%1.f", num);
}

void main(void){
	char numStr[1000] = "0.";
	for(int i = 1 ; i <= 100 ; i++){
		char numberText[10] = "a";
		uint2str(numberText,log10(i) +1,i);
		strcat(numStr, numberText);
	}
	int d = 0;
	scanf("%d",&d);
	printf("%c",numStr[d+2]);
}