N,L=map(int,input().split())

S=[1 for i in range(2*10**6+1)]
S[0]=0
S[1]=0
for i in range(2,2*10**6):
    if S[i]==1:
        for j in range(2,2*10**6):
            if i*j>len(S)-1:
                break
            else:
                S[i*j]=0
#print(S[:6])
ans=0
for i in range(L):
    if S[i]==1:
        if (N-1)*i<=L:
            ans+=(L-(N-1)*i+1)
        else:
            break
print(ans)