include <bits/stdc++.h>

using namespace std;

int main() {

int n, m, y = 0;
cin >> n >> m;
while (n <= m) {
	int x = 0;
	for (int s = 1; s < n; s++) {
		if (n % s == 0) {
			x = x + s;
		}
	}
	if (x == n) {
		y++;
	}
	if (n == 8200) {
		break;
	}
	n++;
}
cout << y;
return 0;

}