#include <bits/stdc++.h>

using namespace std;
long long a[1005][1005];
bool vis[1005][1005];

int main() {
	int n, m, a, b;
	cin >> n >> m;
	a[1][1] = 1;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= n; j++)
			vis[a][b] = true;
	for (int i = 1; i <= m; i++) {
		cin >> a >> b;
	}
	for (int i = 1; i <= n; i++)
		if (vis[i][j] = false || (i == 1 && j == 1)) {
			continue;
		} else if (j == 1 && vis[i][j] == true) {
			a[i][j] = a[i - 1][j];
		} else if (i == 1 && vis[i][j] == true) {
			a[i][j] = a[i][j - 1];
		}


}
cout << a[n][n];
return 0;
}

Complie Error