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#include <bits/stdc++.h>

using namespace std;
typedef long long ll ;

ll fgen(ll base) {
    ll cpy = base;
    int length = 0;

    while (cpy > 0) {
        cpy /= 10;
        ++length;
    }

    ll base_d = 1;
    ll offset = 0;
    for (int i = 0; i < length; ++i) {
        offset += base_d;
        base_d *= 10;
    }

    return offset;
}

int main() {
    ll a;
    cin >> a;

    int state;
    cin >> state;

    ll brute = a;
    ll cpy;
    set<int> digits;
    if (state == 0) {
        int tc = 1;
        while (true) {
            brute = fgen(brute) * tc;
            if (brute < a) {
                ++tc;
            } else {
                cout << brute << "\n";
                return 0;
            }
        }
    } else {
        string s;
        ll cpy = brute;
        int dig_len = 0;
        while (cpy > 0) {
            dig_len += 1;
            cpy /= 10;
        }
        cpy = brute;
        s = string(dig_len, '0');
        for (int i = 0; i < dig_len; ++i) {
            s[dig_len - i - 1] = char(cpy % 10 + int('0'));
            digits.insert(cpy % 10);
            cpy /= 10;
        }

        if ((digits.size() == 2) ||(digits.size() == 1)) {
            cout << s << "\n";
            return 0;
        }

        char cchar = s[0];
        int cindex = 0;
        int cdiff = 0;
        int cpos = 0;

        if (s.size() > 1) {
            cchar = s[1];
            cindex = 1;

            if (s[0] != s[1]) {
                cdiff = 1;
                cpos = 1;
            }
        }

        string result(dig_len, ' ');
        result[0] = s[0];
        if (s.size() == 2) {
            cout << s << "\n";
            return 0;
        }

        if (s.size() == 1) {
            cout << s << "\n";
            return 0;
        }

        int diff_pos = 1;
        char mx_diff_char = s[1];
        int diffs_cnt = 0;

        bool is_updated_higer = false;
        int t_tries = 5000;
        int t_tries_cnt = 0;
        while (true) {
            int curr_diff_index = -1;

            for (int j = diff_pos; j < result.size(); ++j) {
                result[j] = mx_diff_char;

                if (s[j] != result[j]) {
                    if ((s[j] > mx_diff_char) && diffs_cnt < 1) {
                        ++diffs_cnt;
                            // cout << "NEW MAX = " << mx_diff_char << " AT " << j <<  "\n";
                        mx_diff_char = char(int(mx_diff_char) + 1);
                        j = diff_pos - 1;
                    }
                    t_tries_cnt++;
                    if (t_tries_cnt >= t_tries) {
                        break;
                    }
                }
                t_tries_cnt++;
                if (t_tries_cnt >= t_tries) {
                    break;
                }
            }

            cout << result << "\n";
            break;
            int a;
            // cin >> a;
        }
    }

    return 0;
}