ol_2_16

#include <iostream>
#include <fstream>
//#include <string>
//#include <vector>
//#include <cmath>

//#define n 3

using namespace std;

int main()
{
    //ifstream cin("input.txt");

    long n, m;
    cin>>n>>m;
    if (n>m)
        cout<<m;
    else
        cout<<min(n*2, m);

}