#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
import numpy as np

# %%
N, K = map(int, read().split())


# %%
def solve_fixed_k(N, K):
    n = max(N, K).bit_length()
    x = np.arange(1 << n + 1, dtype=np.int32)
    y = x + K
    cond = (x & y == N)
    if np.any(cond & (x ^ y >= (1 << n))):
        return None
    else:
        return np.count_nonzero(cond)


# %%
answer = 0
for k in range(K + 1):
    x = solve_fixed_k(N, k)
    if x is None:
        answer = 'INF'
        break
    answer += x

# %%
print(answer)