#include <bits/stdc++.h>
using namespace std;

int main() {
    const long limit = 1e15;
    vector<long> fibs(2, 1);
    for (;;) {
        fibs.push_back(*fibs.rbegin() + *(fibs.rbegin() + 1));
        if (*fibs.rbegin() >= limit) break;
    }
    vector<long> a(5);
    for (int i = 0; i < 5; i++) {
        cin >> a.at(i);
    }
    int ans = 0, index = -1;
    if (a.at(4) == 1 && a.at(3) == 1) {
        ans += 2;
        index = 2;
    } else {
        for (int i = 1; i < fibs.size(); i++) {
            if (fibs.at(i) == a.at(4)) {
                ans++;
                index = i + 1;
                break;
            }
        }
    }
    if (index == -1) {
        cout << 0 << endl;
    } else {
        for (int i = index; i < fibs.size(); i++) {
            if (ans > 4 || fibs.at(i) != a.at(4 - ans)) {
                break;
            }
            ans++;
            index++;
        }
        cout << ans << endl;
    }
}