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


int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll N,M;
    cin>>N>>M;
    if(N%2==0){
        cout<<N*M<<"\n";
        return 0;
    }
    ll an=0;
    ll P=0;
    for(ll a=35;a>=0;a--){
        if(N==0)break;
        if(M&(1ll<<a)){
            if(P==1){
                an+=(1ll<<a)*(N);
                P=0;
                N--;
                an+=((1ll<<a)-1)*2;
            }
            else{
                an+=(1ll<<a)*(N-1);
                N--;
                P++;
            }
        }
        else{

        }
    }
    cout<<an<<"\n";
}