#include <iostream>
#include <cmath>
#include <string>
using namespace std;

int main() {
	string cq, y;
	int b, i, t;
	long d, ec = 0;
    cin >> b >> d;
    for (i = 0; d > 0; i++) {
    	ec += d % 10 * pow(b, i);
    	d /= 10;
    }
    for (i = 1; cq.length() < ec; i++) {
    	t = i;
    	while (t > 0) {
    		y = to_string(t % b) + y;
    		t /= b;
    	}
    	cq += y;
    	y = "";
    }
    cout << cq[ec-1] << endl;
   return 0;
}