import math
a,b = map(int,input().split())
flag=0
if b<=2:
	print (2)
else:
	for i in range(a,b+1):
		for j in range(2,int(math.sqrt(i))+1):
			if i%j==0:
				flag=1
				break
		if flag==0:
			print(i)
		else:
			flag=0