import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return sys.stdin.readline()[:-1]

n,l=MI()
lim=l//(n-1)+1
isprime=[True]*(lim+1)
ans=0
for d in range(2,lim):
    if not isprime[d]:continue
    for j in range(d**2,lim+1,d):isprime[j]=False
    ans+=l-d*(n-1)+1
print(ans)