#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[Nmax][Gmax];

int main()
{
    int n,m;
    fin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        fin >> g[i] >> p[i];
    }

    for (int i = 0; i <= n; i++)
        for (int j = 0; j <= m; j++)
    {
        D[i][j] = D[i-1][j];

        if(g[i] <= j)
        {
            D[i][j] = max(D[i-1][j],D[i-1][j-g[i]] + p[i]);
        }

    }

    fout << D[n][m];
    return 0;
}