import java.util.Arrays;
import java.util.Comparator;
import java.util.PriorityQueue;
import java.util.Scanner;

class Main {

	public static void main(String[] args) {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		long[] a = new long[n];
		for (int i = 0; i < n; ++i)
			a[i] = sc.nextLong();
		long[] Fib = new long[74];
		Fib[0] = Fib[1] = 1;
		for (int i = 2; i < Fib.length; ++i) {
			Fib[i] = Fib[i - 1] + Fib[i - 2];
		}
		int ans = 0;
		int pos = Arrays.binarySearch(Fib, a[n-1]);
		if(a[n-1]==1&&a[n-2]==1) {
			pos=0;
		}else if(a[n-1]==1) {
			pos=1;
		}
		int p=n-1;
		while (p>=0 && pos >= 0 && Fib[pos] == a[p] && p < a.length) {
			++ans;
			++pos;
			--p;
		}
		System.out.println(ans);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}