#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define MAXN (1000005)
int main() {
ios_base::sync_with_stdio(false);cin.tie(0);
ll L,N;
cin>>L>>N;
ll sum = 0;
pair<long double,long double> arr[N];
for(ll i = 0;i < N;i++){
ll t,speed;
cin>>t>>speed;
arr[i] = make_pair(t,speed);
}
sort(arr,arr + N);
ll memo[N];
memset(memo,0,sizeof(memo));
for(ll i = 0;i < N;i++){
memo[i] = 1;
for(ll j = 0;j < i;j++){
if((L / arr[j].second) + arr[j].first > (L / arr[i].second) + arr[i].first){
memo[i] = max(memo[i],memo[j] + 1);
}
}
sum = max(sum,memo[i]);
}
cout<<sum<<'\n';
}
