#include <bits/stdc++.h>
#define NMAX 5004
#define GMAX 10002
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, G, g[NMAX], c[NMAX], cmax[GMAX];
void citire()
{
    int i;
    fin >>n>>G;
    for (i=1; i<=n; i++) fin >>g[i]>> c[i];
}
void pd()
{
    int i,x;
    for (i=1; i<=n; i++)
        for (x=G; x>0; x--)
            if (x>=g[i])
                if (cmax[x]<c[i]+cmax[x-g[i]]) cmax[x]=c[i]+cmax[x-g[i]];
}

int main()
{
    citire();
    pd();
    fout <<cmax[G]<<'\n';
    fout.close();
    return 0;
}