#include<stdio.h>
int main()
{
	long long int i, j;
	long long int a[5];
	for (i = 0; i < 5; i++)
		scanf("%lld", &a[i]);
	long long int f[90];
	f[0] = 1;
	f[1] = 1;
	for (i = 2; i < 90; i++)
		f[i] = f[i - 1] + f[i - 2];
	int ans = 0;
	i = 0;
	while (f[i] < a[4])
		i++;
	j = 4;
	while (f[i] == a[j])
	{
		ans++;
		i++;
		j--;
		if (j < 0)
			break;
	}
	if (a[4] == 1)
	{
		int v = 0;
		i = 1;
		j = 4;
		while (f[i] == a[j])
		{
			v++;
			i++;
			j--;
			if (j < 0)
				break;
		}
		if (ans < v)
			ans = v;
	}
	printf("%d\n", ans);
	return 0;
}