选大王

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

int main(){
    int n, m;
    while (cin >> n >> m){
        int ans = 0;
        for (int i = 2; i <= n; i++){
            ans = (ans + m) % i;
        }
        cout << ans + 1 << endl;
    }

    return 0;
}