#include <bits/stdc++.h>
using namespace std;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    double a, b, U;
    cin >> a >> b >> U;
    int ans = 1;
    if (a <= U) ans++;
    while (b <= U) {
        ans++;
        double t = sqrt(a * a + b * b);
        a = b;
        b = t;
    }
    cout << ans << '\n';
    return 0;
}