#include <iostream>
#include <fstream>

using namespace std;

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

int v[10001];

int main()
{
    int n, gMax, i, j;
    fin >> n >> gMax;
    for(i = 1; i <= n; i++)
    {
        int gr, pr;
        fin >> gr >> pr;
        for(j = gMax; j >= gr; j--)
        {
            if(v[j - gr] + pr > v[j])
                v[j] = v[j - gr] + pr;
        }
    }
    fout << v[gMax];
    return 0;
}