rt

#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
	int n;
	scanf("%lld",&n);
	for(int i = 1;i <= n;i ++)
	{
		int l,r;
		scanf("%lld%lld",&l,&r);
		for(int j = 1;(l | j) <= r;j ++)l |= j;
		printf("%lld\n", l);
	}
	return 0;
}