A - Dragons

#include <bits/stdc++.h>
#define ll   long long
#define pb   push_back
#define ld   long double
#define sz   size()
#define lala for(ll i=0;i<n;i++)
#define ed   "\n"
#define ct   cout
#define vi   vector<ll>
#define ff   first
#define ss   second

using namespace std;

void bahut_tezz()
{
    std::ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}


void jai_bajrangbali()
{
    ll c,d,e,n,k,x,y,z,cnt=0,res=0,mx=1;
    ll sum=0;
    bool ash=false;
    //string s;
    ll s;
    cin>>s>>n;
    //ll a[n];
    vector <pair<ll,ll>>v;
    while(n--)
    {
        cin>>x>>y;
        v.pb(make_pair(x,y));
    }

    sort(v.begin(),v.end());

    for(ll i=0;i<v.sz;i++)
    {
        if(s<=v[i].ff)
        {
            ct<<"NO"<<ed;
            return;

        }
       s=s+v[i].ss;
    }

    ct<<"YES"<<ed;


}

int main()
{
    bahut_tezz();
    long long t;
    //cin>>t;
    t=1;
    while(t--)jai_bajrangbali();

    return 0;
}