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#include <iostream>
#include <fstream>
using namespace std;
ifstream fi("orase.in");
ofstream fo("orase.out");
int a[2][10];
int main()
{
int m,n,i,s,j,smax=0,c,s1=0,s2=0;
fi>>m>>n;
for(i=1;i<=n;i++)
{
fi>>a[1][i]>>a[2][i];
}
for(i=1;i<=n-1;i++)
for(j=i+1;j<=n;j++)
{
if(a[1][i]>a[1][j])
{
c=a[1][j];
a[1][j]=a[1][i];
a[1][i]=c;
c=a[2][j];
a[2][j]=a[2][i];
a[2][i]=c;
}
}
for(i=1;i<=n;i++)
{
s1=a[2][i]+a[2][i+1]+a[1][i+1]-a[1][i];
s2=a[2][i]+a[2][i+2]+a[1][i+2]-a[1][i];
if(s1>smax)
{
smax=s1;
s1=0;
}
if(s2>smax)
{
smax=s2;
s2=0;
}
}
fo<<smax;
return 0;
}