#include <iostream>

using namespace std;

constexpr size_t MAX_N = 305;


size_t simulate_monkeys(const size_t monkeys_count, const int m) {
    bool monkeys[MAX_N] = {false};
    int died_monkeys_count = 0;
    for (size_t i = 0, current_num = 0;;
         i = (i + 1) % monkeys_count,
         current_num = (current_num + 1) % m) {
        while (monkeys[i]) { i = (i + 1) % monkeys_count; }
        if (current_num == m - 1) { monkeys[i] = true, died_monkeys_count++; }
        if (died_monkeys_count == monkeys_count - 1) { break; }
    }
    for (int i = 0; i < monkeys_count; i++) {
        if (!monkeys[i]) { return i; }
    }
    throw logic_error("???");
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int monkeys_count, m;
    while (cin >> monkeys_count >> m && m) {
        cout << simulate_monkeys(monkeys_count, m) + 1 << endl;
    }

    return 0;
}