C++ :

#include<cstdio>
#include<cstring>
#include<cmath>
#include<iostream>
#include<algorithm>
using namespace std;

int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        long long l,r;
        cin>>l>>r;
        while((l|(l+1))<=r)
        {
            l=(l|(l+1));
        }
        cout<<l<<endl;
    }

    return 0;
}