#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
using namespace std;

template<class T> inline void YES(T condition){ if(condition) cout << "YES" << endl; else cout << "NO" << endl; }
template<class T> inline void Yes(T condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
template<class T> inline void POSS(T condition){ if(condition) cout << "POSSIBLE" << endl; else cout << "IMPOSSIBLE" << endl; }
template<class T> inline void Poss(T condition){ if(condition) cout << "Possible" << endl; else cout << "Impossible" << endl; }
template<class T> inline void First(T condition){ if(condition) cout << "First" << endl; else cout << "Second" << endl; }
template<class T = string, class U = char>int character_count(T text, U character){ int ans = 0; for(U i: text){ ans += (i == character); } return ans; }
long power(long base, long exponent, long module){ if(exponent % 2){ return power(base, exponent - 1, module) * base % module; }else if(exponent){ long root_ans = power(base, exponent / 2, module); return root_ans * root_ans % module; }else{ return 1; }}
struct position{ int y, x; }; position move_pattern[4] = {{-1, 0}, {0, 1}, {1, 0}, {0, -1}}; // double euclidean(position first, position second){ return sqrt((second.x - first.x) * (second.x - first.x) + (second.y - first.y) * (second.y - first.y)); }
template<class T, class U> string to_string(pair<T, U> x){ return to_string(x.first) + "," + to_string(x.second); }
template<class itr> void array_output(itr start, itr goal){ string ans; for(auto i = start; i != goal; i++){ ans += to_string(*i) + " "; } ans.pop_back(); cout << ans << endl; }
template<class itr> void cins(itr start, itr goal){ for(auto i = start; i != goal; i++){ cin >> (*i); } }
template<class T> T gcd(T a, T b){ if(a && b){ return gcd(min(a, b), max(a, b) % min(a, b)); }else{ return a; }} template<class T> T lcm(T a, T b){ return a / gcd(a, b) * b; }
#define mod long(1e9 + 7)
#define all(x) (x).begin(), (x).end()
#define bitcount(n) __builtin_popcountl(long(n))
#define fcout cout << fixed << setprecision(10)
#define highest(x) (63 - __builtin_clzl(x))

int B;

bool subtract(vector<int>& a, int b, int digit){
    int b_tmp = b, digit_tmp = digit;
    vector<int> history;
    while(b_tmp){
        if(digit_tmp >= a.size()){
            for(int i = digit; i < a.size(); i++){
                a[i] = history[i - digit];
            }
            return false;
        }
        history.push_back(a[digit_tmp]);
        a[digit_tmp] -= b_tmp % B;
        b_tmp /= B;
        if(a[digit_tmp] < 0){
            a[digit_tmp] += B;
            b_tmp++;
        }
        digit_tmp++;
    }
    return true;
}

void add(vector<int>& a, int b, int digit){
    int b_tmp = b, digit_tmp = digit;
    while(b_tmp){
        a[digit_tmp] += b_tmp % B;
        b_tmp /= B;
        if(a[digit_tmp] >= B){
            a[digit_tmp] -= B;
            b_tmp++;
        }
        digit_tmp++;
    }
}

pair<vector<int>, int> divide(vector<int> a, int b){
    int surplus = 0;
    vector<int> ans;
    for(int i = int(a.size()) - 1; i >= 0; i--){
        surplus = surplus * B + a[i];
        ans.push_back(surplus / b);
        surplus %= b;
    }
    reverse(all(ans));
    return {ans, surplus};
}

int main(){
    cin >> B;
    string D_str;
    cin >> D_str;
    D_str = "0000000000000000" + D_str;
    reverse(all(D_str));
    vector<int> D;
    for(auto i: D_str){
        D.push_back(i - '0');
    }
    subtract(D, 1, 0);
    int digit = 1;
    while(true){
        if(!subtract(D, digit * (B - 1), digit - 1)){
            break;
        }
        digit++;
    }
    auto divided = divide(D, digit);
    add(divided.first, 1, digit - 1);
    cout << divided.first[digit - divided.second - 1] << endl;
}