#include<fstream>
using namespace std;
ifstream f("carnati.in");
ofstream g("carnati.out");
int n,c;
struct carnati
{
    int t,p;
};
carnati a[2001];
void pret(int cost)
{
    int pretmax=-100,sc=-1,i;
    for(i=1;i<=n;i++)
    {
        if(a[i].p<cost)
        break;
        if(sc!=-1)
        {
            costc=costc-(a[i].t-a[sc].t)*c;

        }
}
int main()
{
    f>>n>>c;
    for(i=1;i<=n;i++)
    f>>a[i].t>>a[i].p;
}