def makeans(n, s, t):
    ans = 0
    if s == t:
        return 0
    for i in range(n, -1, -1):
        if s + 2 ** i <= t and s % (2 ** i) == 0:
            return 1 + makeans(n, s + 2 ** i, t)
    return ans

def solvetest(n, q, st):
    answer = []
    for s, t in st:
        ans = makeans(n, s, t)
        answer.append(ans)
    return answer

n, q = map(int,input().split())
st = [tuple(map(int,input().split())) for _ in range(q)]
answer = solvetest(n, q, st)

for i in answer:
    print(i)