#include <iostream>
using namespace std;

int main()
{
	int g1, s1, b1;
	int g2, s2, b2;
	cin >> g1;
	cin >> s1;
	cin >> b1;
	cin >> g2;
	cin >> s2;
	cin >> b2;
	int count = 0;
	int b3 = 0;
	int s3 = 0;
	if (b1 < b2)
	{
		while (b1<b2)
		{
			if (s1 > 0)
			{
				s1--;
				b1 += 9;
				count++;
			}
			else
			{
				if (g1 >0)
				{
					g1--;
					s1 += 9;
					count++;
				}
				else
				{
					cout << -1;
					return 0;
				}
			}
		}
	}
	else
	{
		b3 = b2 - b1;
	}
	if (s1 < s2)
	{
		while (s1<s2)
		{
			if (b3 >= 11)
			{
				b3 -= 11;
				count++;
				s1++;
			}
			if (g1 > 0)
			{
				g1--;
				s1 += 9;
				count++;
			}
			else
			{
				cout << -1;
				return 0;
			}

		}
	}
	else
	{
		s3 = s2 - s1;
	}
	if (g1 < g2)
	{
		if (s3 >= 11)
		{
			g1++;
			s3 -= 11;
			count++;
		}
		else if (b3 >= 121)
		{
			b3 -= 121;
			count += 12;
			g1++;
		}
		else
		{
			cout << -1;
			return 0;
		}
	}
	cout << count;

	return 0;
}