// Rucsac.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <fstream>
using namespace std;
pair<int, int> v[5005];
int dp[10005];
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
void computeRucsac(int W, int n) {
    for (int i = 0; i < n; i++) {
        for (int j = W; j >= 0; j--) {
            if (j >= v[i].first) {
                dp[j] = max(dp[j], dp[j - v[i].first] + v[i].second);
            }
        }
    }
}
int main()
{
    int n, g;
    cin >> n >> g;
    for (int i = 0; i < n; i++)
        cin >> v[i].first >> v[i].second;
    computeRucsac(g, n);
    cout << dp[g];
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

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//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file