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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("carnati.in");
ofstream fout("carnati.out");
int p[2001], t[2001];
int main()
{
int c, i, j, n, maxs=0, s, ok;
fin >> n >> c;
for(i=1; i<=n; i++)
{
fin >> t[i] >> p[i];
}
t[0]=t[1];
for(i=1; i<=n; i++)
{
s=0;
ok=0;
for(j=1; j<=n; j++)
{
if(ok==1)
{
s-=(t[j]-t[j-1])*c;
}
ok=1;
if(s<=0)
{
s=0;
}
if(p[i]<=p[j])
{
s+=p[i];
}
if(maxs<s)
{
maxs=s;
}
}
}
fout << maxs-c;
return 0;
}