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

const int M = 1e9 + 7;

const int N = 20;

int dp[1 << N][N];

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, m;
	cin >> n >> m;
	vector<tuple<int, int, int>> edges(m);
	for(int i = 0; i < m; ++i) {
		int u, v;
		cin >> u >> v;
		--u, --v;
		edges[i] = {u, v, (1 << u) | (1 << v)};
	}
	vector<pair<int, int>> masks;
	for(int i = 0; i < (1 << n); ++i) {
		int j = __builtin_popcount(i);
		if(j >= 2) {
			masks.emplace_back(j, i);
		}
	}
	sort(masks.begin(), masks.end());
	dp[1][0] = 1;
	for(int id = 0; id < (int) masks.size(); ++id) {
		int mask = masks[id].second;
		for(auto& [u, v, c] : edges) {
			if((mask & c) == c) {
				dp[mask][v] = (dp[mask][v] + dp[mask ^ (1 << v)][u]) % M;
			}
		}
	}
	cout << dp[(1 << n) - 1][n - 1] << "\n";
	return 0;
}