class UnionFind:
    def __init__(self, n):
        self.par = [i for i in range(n+1)]
        self.rank = [0] * (n+1)
        self.size = [1 for _ in range(n+1)]
    # 検索
    def find(self, x):
        if self.par[x] == x:
            return x
        else:
            self.par[x] = self.find(self.par[x])
            return self.par[x]
    # 併合
    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if self.rank[x] < self.rank[y]:
            self.par[x] = y
            self.size[y] += self.size[x]
        else:
            self.par[y] = x
            self.size[x] += self.size[y]
        if self.rank[x] == self.rank[y]:
            self.rank[x] += 1
    # 同じ集合に属するか判定
    def same_check(self, x, y):
        return self.find(x) == self.find(y)

n,p = map(int,input().split())
ki = UnionFind(n+1)
chk = [0]*(n+1)

for i in range(2,n):
    if chk[i] == 1:
        continue
    tmp = 2
    while tmp*i <= n:
        ki.union(i,tmp*i)
        chk[tmp*i] = 1
        tmp += 1
        #print(i,tmp*i)

ans = 0
idx = ki.par[p]

for i in range(n):
    if ki.par[i+1] == idx:
        ans += 1

print(ans)