#include <cstdio>
using namespace std;

bool x[10000010];
void sosu(int n, int l) {
	for (int i = 2; i <= l; i++) {
		if(!x[i]){
		for (int j = 2; i*j <= l; j++) {
			x[i * j] = true;
		}
		}
	}
	/*for (int i = 2; i <= l; i++) {
	if(!x[i]) cout << i << " ";
	}
	cout << endl;
	*/
}
int main(void) {
	long long int tmp, N, L, d, round = 0, ans = 1;
	scanf("%Ld %Ld", &N, &L);
	sosu(N,L);

	for (int i = 2; ; i++) {
		if(!x[i]){ d = i;
		tmp = (i-1) * (N-1)+N;
		if(tmp > L+1) break;
		else tmp = L+1 - tmp + 1;
		round += tmp;
		}
	}

	printf("%Ld\n", round);
	//else cout << 0 << endl;

	return 0;
}