n, l = [ int(v) for v in input().split() ]
def shave(a):
    aroot = int(a**0.5)
    modlist = [2] + [i for i in range(3,aroot+1,2)]
    outlist = [i for i in range(2,a+1)]

    for j in modlist:
        outlist = [i for i in outlist if i % j != 0 or i == j]
    return outlist

dmax = l // (n-1)
anslist = shave(dmax)

if anslist == 0:
    print(0)

else:
    s = 0
    for i in range(len(anslist)):
        s += l + 1 - anslist[i] * (n-1)
    print(s)