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;
}