include <bits/stdc++.h>

using namespace std;

int monkey_king(long long n,long long m) { int rear=0; for(int i=2; i<=n; i++) {

rear=(rear+m)%i;

} return rear+1; }

int main() { long long n,m; cin>>n>>m; cout<<monkey_king(n,m)<<'\n'; return 0; }