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#include <iostream>

using namespace std;

bool liczba_potyczkowa(uint64_t);

uint64_t l, r;
uint64_t n = 0;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	cin >> l >> r;

	while(l <= r) {
		n += liczba_potyczkowa(l++);
	}

	cout << n;

	return 0;
}

bool liczba_potyczkowa(uint64_t m) {
	uint64_t _m = m;
	uint8_t mod;

	do {
		mod = _m % 10;
		switch(mod) {
			case 0:
				return false;
			case 1:
				break;
			default:
				if(m % mod != 0)
					return false;
		}
	} while((_m /= 10) != 0);

	return true;
}