#include <bits/stdc++.h>
using namespace std;
const int N=1e6+10;
int n,k,now,f[N];
int main() {
    freopen("Gold_coin.in","r",stdin);
    freopen("Gold_coin,.out","w",stdout);
    cin>>n>>k;now=n;
    while (now>1)
    {
        int q=1;
        for (int i=1;i<=n;i++)
        {
            if (f[i]==0)
            {
                if (q==1)
                {
                    f[i]=1;
                    now--;
                }
                q=(q+1)%k;
            }
        }
    }
    for (int i=1;i<=n;i++)
    {
        if (f[i]==0)
        {
            cout<<i;
            return 0;
        }
    }
}