#include <bits/stdc++.h>
#define NMAX 5005
#define GMAX 10005
#define infile "rucsac.in"
#define outfile "rucsac.out"

using namespace std;

int n, g, p[NMAX], w[NMAX], dp[2][GMAX];

void read()
{
    freopen(infile, "r", stdin);
    freopen(outfile, "w", stdout);

    scanf("%d %d", &n, &g);
    for (int i = 0; i < n; i++)
    {
        scanf("%d %d", &w[i], &p[i]);
    }

    fclose(stdin);
}

void solve()
{
    for (int i = 0; i < g; i++)
    {
        dp[0][i] = 0;
    }

    for (int i = 0; i < n; i++)
    {
        for (int j = 1; j <= g; j++)
        {
            if (j >= w[i])
                dp[1][j] = max(dp[0][j], dp[0][j - w[i]] + p[i]);
            else
                dp[1][j] = dp[0][j];
        }

        for (int j = 1; j <= g; j++)
        {
            dp[0][j] = dp[1][j];
        }
    }
    printf("%d", dp[0][g]);
}

int main()
{
    read();
    solve();
    return 0;
}