#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int w[10001], p[10001], g, n, i, cw, optim[5001];
int sol, j;
int main() {
    fin >> n >> g;
    for (i = 1; i <= n; i++)
        fin >> w[i] >> p[i];
    for (i = 1; i <= n; i++)
        for (j = g - w[i]; j >= 0; j--)
            if (optim[j + w[i]] < optim[j] + p[i]){
                optim[j + w[i]] = optim[j] + p[i];
                if (optim[j + w[i]] > sol)
                    sol = optim[j + w[i]];
            }
    fout << sol;
}