#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <tuple>
#include <cstdint>
#include <cstdio>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <unordered_map>
#include <unordered_set>
#include <bitset>
#include <cctype>
#include <numeric>
#include <cmath>

#define ll long long int
#define pb push_back
#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,n) for(int i=1;i<=(n);i++)
using namespace std;

int mx8[] = {0,0,1,-1,-1,1,-1,1};
int my8[] = {-1,1,0,0,-1,-1,1,1};
int mx4[] = {1,-1,0,0};
int my4[] = {0,0,-1,1};
const int MOD = 1000000007;


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

    bool ok = true;
    ll g = 0, T = 0;
    rep(i,m){
        ll t, p;
        cin >> t >> p;
        T += t;
        if(abs(g-p) <= T) {
            g = p;
            T -= abs(g-p);
        }
        else{
            ok = false;
            break;
        }
    }
    if(ok) cout << "Yes" << endl;
    else cout << "No" << endl;
}