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#include<bits/stdc++.h>
using namespace std;
ifstream fin("carnati.in");
ofstream fout("carnati.out");
int t[1501],spart[1501],pmax;
int main()
{
int n,c,x;
fin>>n>>c;
for(int i=1;i<=n;i++)
{
fin>>x>>t[x];
}
for(int i=1;i<=n;i++)
spart[i]=spart[i-1]+t[i];
for(int i=1;i<=n;i++)
for(int j=i;j<=n;j++)
if(pmax<spart[j]-spart[i-1]-c*(j-i+1))
pmax=spart[j]-spart[i-1]-c*(j-i+1);
fout<<pmax;
}