import sys
input = sys.stdin.readline

class UnionFind():
    def __init__(self, n):
        self.par = [-1]*n
        self.rank = [0]*n
        self.siz = [1]*n
    
    def root(self, x):
        if self.par[x] == -1:
            return x
        self.par[x] = self.root(self.par[x])
        return self.par[x]
    
    def is_same(self, x, y):
        return self.root(x) == self.root(y)
    
    def unite(self, x, y):
        if self.is_same(x, y):
            return False
        
        rx = self.root(x)
        ry = self.root(y)
        if self.rank[rx] < self.rank[ry]:
            rx, ry = ry, rx
        elif self.rank[rx] == self.rank[ry]:
            self.rank[rx] += 1
        
        self.par[ry] = rx
        self.siz[rx] += self.siz[ry]
        return True
    
    def size(self, x):
        return self.siz[self.root(x)]

n, p = map(int, input().split())
uf = UnionFind(n+1)
for i in range(2, n//2+1):
    for j in range(i, n+1, i):
        uf.unite(i, j)

print(uf.size(p))