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#include <bits/stdc++.h>
using namespace std;
ifstream fin("orase.in");
ofstream fout("orase.out");
int m, n,v[50002][2], dmax;
int main()
{
int i, j;
fin>>m>>n;
for(i=1; i<=n; i++) fin>>v[i][0]>>v[i][1];
for(i=1; i<=n-1; i++)
for(j=i+1; j<=n; j++)
dmax=max(dmax,max(v[i][0],v[j][0])-min(v[i][0],v[j][0])+v[i][1]+v[j][1]);
fout<<dmax<<'\n';
return 0;
}