#include <iostream>
#include <fstream>

using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");

long long m[2][10001];
int Gmax,g,v,auxv;
short n;
bool crt;
int main()
{
    fin>>n>>Gmax;
    for (int i=1;i<=n;i++)
    {
        fin>>g>>v;
        for (int j=g;j<=Gmax;j++)
        {
            auxv=v+m[1-crt][j-g];
            if (auxv>m[1-crt][j])
                m[crt][j]=auxv;
            else m[crt][j]=m[1-crt][j];
        }
        for (int j=1;j<g;j++)
            m[crt][j]=m[1-crt][j];
        crt=1-crt;
    }
    fout<<m[1-crt][Gmax];
    return 0;
}