N,L = map(int,input().split())
NL = L // (N - 1)
if NL == 0:
    print(0)
    exit()
X = [1] * (NL + 1)
X[0] = 0
X[1] = 0
for i in range(NL):
    if X[i] == 1:
        for j in range(2,NL//i + 1):
            X[i * j] = 0
NP = sum(X)
ans = NP * (L + 1)
tmp = 0
for i in range(NL + 1):
    if X[i] == 1:
        tmp += i
ans -= tmp * (N - 1)
print(ans)