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#include <iostream>
#include <set>
#include <string>
#include <vector>

using namespace std;
using PII = pair<int, int>;

int main()
{
	int n, m, a, b;
	cin >> n >> m;

	string str;

	for (int i = 0; i < n; ++i)
	{
		cin >> a;

		str += to_string(a);
	}

	vector<PII> switches(m);

	for (int i = 0; i < m; ++i)
	{
		cin >> a >> b;

		switches[i] = { a - 1, b - 1 };
	}

	set<string> cur;
	set<string> nxt;

	cur.insert(str);
	nxt.insert(str);

	while (true)
	{
		for (int i = 0; i < m; ++i)
		{
			for (const auto& x : cur) 
			{
				if (x[switches[i].first] == x[switches[i].second])
				{
					string n = x;

					if (n[switches[i].first] == '0')
					{
						n[switches[i].first] = '1';
						n[switches[i].second] = '1';
					}
					else
					{
						n[switches[i].first] = '0';
						n[switches[i].second] = '0';
					}

					nxt.insert(n);
				}
			}
		}

		if (cur.size() == nxt.size())
			break;

		swap(cur, nxt);
	}

	int res = cur.size();

	cout << res;

	return 0;
}