#include <bits/stdc++.h>
using namespace std;

int dp[10005], w[5005], p[5005];

int main()
{
    ifstream cin("rucsac.in");
    ofstream cout("rucsac.out");
    int n, G;
    cin >> n >> G;

    for (int i = 1; i <= n; ++i)
    {
        int g, v;
        cin >> g >> v;
        for (int j = G; j >= g; --j)
            dp[j] = max(dp[j], dp[j-g]+v);
    }

    cout << dp[G];

    return 0;
}