package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	var N, K int
	ans := 1

	fmt.Fscan(in, &N, &K)
	val := N - K
	list, m := soinsu(val, K)

	//fmt.Println(list, m)

	for i := 0; i < len(list); i++ {
		ans *= (m[list[i]] + 1)
		//fmt.Println(m[list[i]] + 1)
	}
	if K == 0 {
		ans += 1
	}
	ans -= 1

	fmt.Println(ans)
}

func soinsu(N, K int) ([]int, map[int]int) {
	list := make([]int, 0)
	m := make(map[int]int)
	for i := K + 1; i < N; i++ {
		if i*i > N {
			break
		}
		if N%i != 0 {
			continue
		}
		if i == 1 {
			continue
		}
		for N%i == 0 {
			if _, ok := m[i]; ok {
				m[i]++
			} else {
				m[i] = 1
				list = append(list, i)
			}
			N /= i
		}
	}
	if N != 1 && K < N {
		list = append(list, N)
		if _, ok := m[N]; ok {
			m[N]++
		} else {
			m[N] = 1
		}
	}
	return list, m
}