class UnionFind:
    def __init__(self, size):
        self.data = [-1 for _ in range(size)]

    def find(self, x):
        if self.data[x] < 0:
            return x
        else:
            self.data[x] = self.find(self.data[x])
            return self.data[x]

    def union(self, x, y):
        x, y = self.find(x), self.find(y)
        if x != y:
            if self.data[y] < self.data[x]:
                x, y = y, x
            self.data[x] += self.data[y]
            self.data[y] = x
        return (x != y)

    def same(self, x, y):
        return (self.find(x) == self.find(y))

    def size(self, x):
        return -self.data[self.find(x)]


def prime_table(n):
    list = [True for _ in range(n + 1)]
    i = 2
    while i * i <= n:
        if list[i]:
            j = i + i
            while j <= n:
                list[j] = False
                j += i
        i += 1

    table = [i for i in range(n + 1) if list[i] and i >= 2]
    return table


N, P = [int(i) for i in input().split()]
uf = UnionFind(N + 1)
for p in prime_table(N):
    q = p
    while q <= N:
        uf.union(p, q)
        q += p
print(uf.size(P))