#include <iostream>
using namespace std;

int main() {
    int a = 1;
    int b = 1;

    int c = a + b;

    int p, k;
    cin >> p >> k;

    int brojac = 0;
    if(a >= p) {
        brojac += 2;
    }


    while(c <= k) {
        if(c >= p and c <= k) {
            brojac += 1;
        }
        a = b;
        b = c;

        c = a + b;
    }

    cout << brojac << endl;
    return 0;
}