N,L = map(int,input().split())
INFTY = L//(N-1)
P = list(range(INFTY+1))
for i in range(2,INFTY+1):
    if i*i>INFTY:break
    for j in range(i*i,INFTY+1,i):
        P[j] = P[i]
Q = []
for i in range(2,INFTY+1):
    if P[i]==i:
        Q.append(i)
ans = 0
for d in Q:
    ans += L+1-d*(N-1)
print(ans)