m,l=map(int,input().split())
n=l//(m-1)
L=list(range(n))
P=set()
for i in L:
	if L[i]<2:continue
	L[::i]=[0]*(n//i+(n%i>0))
	P.add(i)
c=0
for p in P:c+=l-(m-1)*p+1
print(c)