#include <iostream>
#include <cstdio>
#include <vector>
#include <cmath>
#include <cstring>
#include <numeric>
#include <algorithm>
#include <functional>
#include <array>
#include <map>
#include <queue>
#include <limits.h>
#include <stack>

using namespace std;

#define Getsign(n) ((n > 0) - (n < 0))
#define QWERTYR(c) (c == 'y' || c == 'u' || (c >= 'h' && c <= 'p') ?	true : false)
map<string, int> roma_time = { { "I",1 },{ "II",2 },{ "III",3 },{ "IIII",4 },{ "V",5 },{ "VI",6 },{ "VII",7 },{ "VIII",8 },{ "IX",9 },{ "X",10 },{ "XI",11 },{ "XII",12 } };

typedef vector<int> Ivec;
typedef pair<int, int> pii;
int arr[5000000] = {};
void Eratosthenes(int N) {
	for (int i = 0; i < N; i++) {
		arr[i] = 1;
	}
	for (int i = 2; i < sqrt(N); i++) {
		if (arr[i]) {
			for (int j = 0; i * (j + 2) < N; j++) {
				arr[i *(j + 2)] = 0;
			}
		}
	}
}

int main() {
	int n, l;

	scanf("%d %d", &n, &l);
	Eratosthenes(5000012);
	int soscou = 0;
	for (int i = 2; 5000012 > i; i++) {
		if (arr[i]) {
			arr[soscou] = i;
			soscou++;
		}
	}
	long long int sum = 0;
	for (int i = 0; (n - 1)*arr[i] <= l; i++) {
		if (arr[i] == 4999999) {
			printf("");
		}
		sum += l - (n - 1)*arr[i] + 1;
	}

	printf("%lld\n", sum);
	return 0;
}