#include <bits/stdc++.h>

using namespace std;
int ucln(int a, int b) {
    while (a != 0 && b != 0) {
        if (a > b) a = a % b;
        else b = b % a;
    }
    return a + b;
}
int sdn(int a) {
    int d = 0;
    while (a != 0) {
        d = d * 10 + a % 10;
        a = a / 10;
    }
    return d;
}
int a, b, d = 0;
int main() {
    cin >> a >> b;
    for (int i = a; i <= b; i++) {
        if (ucln(i, sdn(i)) == 1) d++;
    }
    cout << d;
    return 0;
}