package main

import (
	"fmt"
	"math"
)

func main() {
	var n, l int
	_, _ = fmt.Scan(&n, &l)

	cnt := 0
	p := make([]int, 0)
	for i := 2; ; i++ {
		// 素数かのチェック
		isP := true
		sq := math.Sqrt(float64(i))
		for _, a := range p {
			if float64(a) > sq {
				break
			}
			if i%a == 0 {
				isP = false
				break
			}
		}
		if !isP {
			continue
		}

		p = append(p, i)
		max := (n - 1) * i
		if max > l {
			break
		}

		cnt += l - max + 1
	}
	fmt.Println(cnt)
}