#include <bits/stdc++.h>

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
/// mem ultimele 2 linii
vector<int> u(10002), c(10002); /// marimea greutatii
int n, g, i, j;
int pr, gr;

int main() {
    fin >> n >> g;
    for(i = 1; i <= n; i++) {
        fin >> gr >> pr;
        for(j = gr; j <= g; j++) c[j] = max(u[j], u[j - gr] + pr);
        u = c;
    }
    fout << c[g];

    return 0;
}