#include <bits/stdc++.h>
#define MAXN 5005
#define MAXG 10005

using namespace std;

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

int n, g, dp[MAXN][MAXG];
struct Obiect {
    int w, p;
} obiecte[MAXN];

void citire() {
    fin >> n >> g;
    for (int i = 1; i <= n; i++)
        fin >> obiecte[i].w >> obiecte[i].p;
}

void rezolvare() {
    for (int i = 1; i <= n; i++)
        for (int j = 0; j <= g; j++) {
            dp[i][j] = dp[i - 1][j];
            if (obiecte[i].w <= j && dp[i - 1][j - obiecte[i].w] + obiecte[i].p > dp[i][j])
                dp[i][j] = dp[i - 1][j - obiecte[i].w] + obiecte[i].p;
        }

    /*cout << "   ";
    for (int j = 1; j <= g; j++)
        cout << j << ' ';
    cout << '\n';
    for (int i = 1; i <= n; i++) {
        cout << i << ". ";
        for (int j = 1; j <= g; j++)
            cout << dp[i][j] << ' ';
        cout << '\n';
    }*/

    fout << dp[n][g];
}

int main() {
    citire();
    rezolvare();
    return 0;
}