#include <iostream>
#include <fstream>
using namespace std;

#define MAXN 5005
#define MAXG 10005

ifstream f("energii.in");
ofstream g("energii.out");

int w[MAXN], p[MAXN];
int optim[MAXG] = {0};

int main()
{
    int n, gr;
    f >> n >> gr;
    for (int i = 1; i <= n; i++) {
        f >> w[i] >> p[i];
    }

    int sol = 0;

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

    g << sol;

    return 0;
}