#include <fstream>
#include <algorithm>
#define nmax 10005

using namespace std;

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

int w[nmax], v[nmax], n, g, a[5][nmax];

int main()
{
    fin>>n>>g;
    for(int i=0;i<n;i++)
        fin>>w[i]>>v[i];
    int cln=0,oln;
    for(int j=0;j<n;j++)
    {
        oln=cln;
        cln=1-cln;
        for(int i=1;i<=g;i++)
        {
            if(w[j]>i)
                a[cln][i]=a[oln][i];
            else
                a[cln][i]=max(a[oln][i],a[oln][i-w[j]]+v[j]);
        }
    }
    fout<<a[cln][g];
    return 0;
}