#include <bits/stdc++.h> using namespace std; const int N = 1e6 + 005; vector <int> v; int main() { int n, m; cin >> n >> m; for (int i = 1; i <= n; i++) v.push_back(i); int nowstart = 1; while (v.size() != 1) { nowstart += m; nowstart %= v.size(); v.erase(v.begin() + nowstart); } cout << v[0] << endl; return 0; }