//50 #include <bits/stdc++.h> using namespace std; int n,m; vector <int> e[4003]; vector <char> w[4003]; int u,v; char c; int main () { cin >> n >> m; if (n == m) { int cnt = 0; for (int i = 1;i <= m;i++) { cin >> u >> v >> c; if (c == '(') { cnt++; } } if (cnt * 2 == m) { cout << "Yes" << endl; } else { cout << "No" << endl; } return 0; } cout << "Yes" << endl; return 0; }