#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int w[5000],p[5000],pmaxn,G,i,m,s[100000],n,j;
int main()
{
f>>n>>G;
for(i=1;i<=n;i++)
    f>>w[i]>>p[i];
    for(i=1;i<=n;i++)
       {
        for(j=G;j>=w[i];j--)
        s[j]=max(s[j],s[j-w[i]]+p[i]);
       }
    g<<s[G];

    return 0;
}