#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<cmath>
#define ll long long
using namespace std;
ll n,m,ans;
void write(ll n){if(n<0){putchar('-');write(-n);return;}if(n>9)write(n/10);putchar(n%10+'0');}
ll read(){ll x=0,f=1;char ch=getchar();while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}while(ch>='0'&&ch<='9'){x=(x<<1)+(x<<3)+(ch^48);ch=getchar();}return x*f;}
int main(){
    n=read();m=read();
    if(n==m){write(n);return 0;}
    if(m==1) for(int i=1; i<=n; i++) if((1<<i)>=n){write(i);return 0;}
    for(int i=1; i<=n; i++) if((1<<i)>=n){ans=i;break;}
    write(ans*(m-1)+1);putchar('\n');
    return 0;
}