#include <bits/stdc++.h>
#define Nmax 5010
#define Gmax 10010
using namespace std;

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

int g[Nmax], p[Nmax];
int D[2][Gmax];

int main()
{
    int n,m;
    fin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        fin >> g[i] >> p[i];
    }
bool u = 0;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 0; j <= m; j++)
    {
        if (u)
        {
            D[u][j] = D[!u][j];

            if(g[i] <= j)
            {
                D[u][j] = max(D[!u][j],D[!u][j-g[i]] + p[i]);
            }
        }
        else
        {
            D[u][j] = D[!u][j];

            if(g[i] <= j)
            {
                D[u][j] = max(D[!u][j],D[!u][j-g[i]] + p[i]);
            }
        }
    }
    u = !u;
    }

    fout << D[!u][m];
    return 0;
}