import strutils, sequtils

proc makeB(A: seq[int], p: int): seq[int] =
  for a in A: result.safeAdd(a mod p)

proc judge(B: seq[int]): bool =
  if B.deduplicate.len == B.len:
    if B[1] == B.max or B[1] == B.min:
      result = true

let A = stdin.readLine.split.map parseInt
var cnt = 0

if A.judge:
  echo "INF"
else:
  for p in 1 .. A.max:
    if A.makeB(p).judge:
      cnt += 1

  echo cnt