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#include <bits/stdc++.h>
using namespace std;
ifstream fin("orase.in");
ofstream fout("orase.out");
int m,n;
struct strada{
int d,l;
}A[50001];
bool ord(strada a, strada b)
{
if(a.d<b.d)
return true;
if(a.d==b.d && a.l>b.l)
return true;
return false;
}
int main()
{
fin>>m>>n;
for(int i=1;i<=n;i++)
fin>>A[i].d>>A[i].l;
int distMax=0;
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++)
distMax=max(distMax,A[i].l+A[j].l+abs(A[j].d-A[i].d));
fout<<distMax;
return 0;
}