#include <iostream>
#include <fstream>
#define NMAX 5001
#define GMAX 10001

using namespace std;

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

int n, g;

int ans;

int w[NMAX];
int p[NMAX];

int dp[GMAX];

int main()
{
    fin >> n >> g;
    for (int i = 1; i <= n; i++)
        fin >> w[i] >> p[i];
    for (int i = 1; i <= n; i++)
    {
        for (int j = g - w[i]; j >= 0; j--)
        {
            if (dp[j] + p[i] > dp[j + w[i]])
            {
                dp[j + w[i]] = dp[j] + p[i];
                if (dp[j + w[i]] > ans)
                    ans = dp[j + w[i]];
            }
        }
    }
    fout << ans;
    return 0;
}