#include<fstream>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int optim[5001], w[5001], p[5001], n, i, j, g;

int main() {
    fin >> n; fin >> 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];
    }
    fout << optim[g];
}