#include <bits/stdc++.h>
#define nmax 5007
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");

int n, G;
int g[nmax], p[nmax];
int dp[2][2*nmax];

void Citire()
{
    int i;
    fin >> n >> G;
    for (i = 1; i <= n; i++)
        fin >> g[i] >> p[i];
}

void DP()
{
    int i, j, maxim, lin0, lin1;
    /// initializari
    lin0 = 0;
    lin1 = 1;
    dp[lin0][g[1]] = p[1];

    for (i = 2; i <= n; i++)
    {
        for (j = 1; j <= G; j++)
            if (j < g[i])
                dp[lin1][j] = dp[lin0][j];
            else
                dp[lin1][j] = max(dp[lin0][j-g[i]] + p[i], dp[lin0][j]);
        swap(lin1, lin0);
    }

    maxim = -1;
    for (i= 0; i <= G; i++)
        maxim = max(maxim, dp[lin0][i]);

    fout << maxim << "\n";
}

int main()
{
    Citire();
    DP();
    fin.close();
    fout.close();
    return 0;
}