T=int(input())
fa=[]
for _ in range(T):
    L,R=map(int,input().split())
    ans=-1
    if L==0:
        ans=0
    for i in range(30):
        if L<=2**i-1 and 2**i<=R:
            ans = max(ans, (2**i-1)*(2**i))
    fa.append(ans)
for a in fa:
    print(a)