package main

import "fmt"

func main() {
	var N, L int
	fmt.Scan(&N, &L)

	right := L / (N - 1)
	field := make([]bool, right + 1)

	ans := 0
	for i := 2; i <= right; i++ {
		if !field[i] {
			for k := i * i; k <= right; k += i {
				field[k] = true
			}
			ans += L - i * (N - 1) + 1
		}
	}

	fmt.Println(ans)
}