#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define precise(i) fixed << setprecision(i)
using ll = int64_t;
using ul = uint64_t;
using namespace std;

void solve() {
  int n, m;
  cin >> n >> m;
  ll time = 0, pos = 0;
  rep(i, m) {
    ll t, p;
    cin >> t >> p;
    time = abs(time - t);
    pos = abs(pos - p);

    debug(time, pos);

    if (time < pos) {
      cout << "No" << endl;
      return;
    }
  }
  cout << "Yes" << endl;
}

void wrapper() {
  rep(i, 2) {
    cout << "[TEST " << i << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}