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

int main()
{
	vector<int> as(3), bs(3);
	for (auto &&a : as)
	{
		cin >> a;
	}
	for (auto &&b : bs)
	{
		cin >> b;
	}

	if (multiset<int>(as.begin(), as.end()) == multiset<int>(bs.begin(), bs.end()))
	{
		int cnt = 0;
		for (int i = 0; i < 3; i++)
		{
			if (as[i] != bs[i])
			{
				cnt++;
			}
		}
		cout << (cnt + 1) / 2 << endl;
	}
	else
	{
		cout << "No" << endl;
	}

	return 0;
}