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

int main(){
    int i,k=0,d;
    char str[128];
    scanf("%d",&d);
    for(i=1;k+1>=d;i++){
        sprintf(&str[k],"%d",i);
        k+=floor(log(i)/log(10));
    }
    printf("%d",str[d-1]);
    return 0;
}