package main

import "fmt"

func main() {
	var N, L int
	fmt.Scan(&N, &L)
	sieves := getSieves(L / (N - 1))
	ans := 0
	for _, v := range sieves {
		ans += L - v * (N - 1) + 1
	}
	fmt.Println(ans)
}

func getSieves(N int) []int {
	field := make([]bool, N + 1)
	sieves := make([]int, 0)
	for i := 2; i <= N; i++ {
		if !field[i] {
			for k := i * i; k <= N; k += i {
				field[k] = true
			}
			sieves = append(sieves, i)
		}
	}
	return sieves
}