A = [int(i) for i in input().strip().split(' ')]
if(min(A) == A[1] or max(A) == A[1]):
  print('INF')
  exit(0)

cnt = 0
for i in range(1, 1001):
  B = [j % i for j in A]
  if len(list(set(B))) == 3:
    if(min(B) == B[1] or max(B) == B[1]):
      cnt += 1

print(cnt)