#include <stdio.h>

typedef long long int LL;

LL n, l, ans;

int comp[10000001];

int main() {
	scanf("%lld%lld", &n, &l);
	
	for(int i = 2; i <= 10000000; i++) {
		if(comp[i] == 0) {
			for(int j = i * 2; j <= 10000000; j += i) {
				comp[j] = 1;
			}
		}
	}
	
	ans = 0;
	for(LL i = 2; i <= 10000000; i++) {
		if(comp[i] == 0) {
			LL temp = l + 1 - i * (n - 1);
			if(temp > 0) { ans += temp; }
		}
	}
	
	printf("%lld\n", ans);
	
	return 0;
}