#include<bits/stdc++.h> 
using namespace std;

#define ll long long
#define foru(a,b,c) for(ll a=b;a<=c;a++)

ll n,k;
bool b[10000005];

int main(){
    freopen("Gold_coin","r",stdin);
    freopen("Gold_coin.out","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>k;
    foru(i,1,1e7)b[i]=1;
    ll sum=n;
    while(sum>1){
        ll cnt=0;
        for(ll i=1;i<=n&&sum>1;i++){
            cnt+=b[i];
            if(cnt%k==1&&b[i]){
                b[i]=0;
                sum--;
            }
        }
    }
    foru(i,1,n)if(b[i])cout<<i;
    return 0;
}//20 10007 20 0