//#include <iostream>
#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
const int Max=10005;
int v[Max],n,gr,pr,G;
int main()
{
    in>>n>>G;
    for(int i=1;i<=n;i++)
    {
        in>>gr>>pr;
        for(int j=G-gr;j>=0;j--)
        {
            v[j+gr]=max(v[j+gr],v[j]+pr);
        }
    }
    out<<v[G];

    return 0;
}