#coding:utf-8

def main():

	A=map(int,raw_input().split())
	
	if A[1]==1:
		return 'INF'
	
	cnt=0
	for p in range(1,max(A)+1):
		B=[]
		for i in A:
			B.append(i%p)
		if len(set(B))==3:
			if max(B)==B[1] or min(B)==B[1]:
				cnt+=1
	
	return cnt

if __name__=='__main__':
	print main()