#include <bits/stdc++.h>
#define Hoshimachi signed
#define Suisei main
using namespace std;
#define int long long
#define pii pair<int,int>
int h,k,ans=0;
bool cmp(pii a, pii b){
    return a.first*b.second<a.second*b.first;
}
vector<pii> v;
void dfs(pii a, pii pl, pii pr, int st, int ed){
    int l=st,r=ed,m,kq=-1;
    while(l<=r){
        m=(l+r)/2;
        if(cmp(v[m],a)){
            l=m+1;
            kq=m;
        }
        else{
            r=m-1;
        }
    }
    int edl=kq;
    l=st,r=ed,kq=1e9;
    while(l<=r){
        m=(l+r)/2;
        if(cmp(a,v[m])){
            r=m-1;
            kq=m;
        }
        else{
            l=m+1;
        }
    }
    int str=kq;
    pii al={a.first+pl.first,a.second+pl.second};
    pii ar={a.first+pr.first,a.second+pr.second};
    if(edl>=st){
        dfs(al,pl,a,st,edl);
        ans++;
    }
    if(str<=ed){
        dfs(ar,a,pr,str,ed);
        ans++;
    }
}
Hoshimachi Suisei(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    // freopen(".inp", "r", stdin);
    // freopen(".out", "w", stdout);
    cin>>h>>k;
    for(int i=1; i<=k; i++){
        int a,b;
        cin>>a>>b;
        v.push_back({a,b});
    }
    sort(v.begin(),v.end(),cmp);
    v.erase(unique(v.begin(),v.end()),v.end());
    dfs({1,1},{0,1},{1,0},0,v.size()-1);
    cout<<ans;
}