#include <iostream>
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    int dp[1005]{0};
    for (int i = 0; i < n; i++)
    {
        int s, a;
        cin >> s >> a;
        int d[1005];
        for (int j = 0; j <= m; j++)
        {
            d[j] = dp[j];
        }
        for (int j = s; j <= m; j++)
        {
            d[j] = max(d[j], dp[j - s] + a);
        }
        swap(dp, d);
    }
    cout << dp[m] << endl;
}