#include <fstream>

using namespace std;

ifstream cin("rucsac.in");
ofstream cout("rucsac.out");

int n, m;
int dp[10005], a[5005], b[5005];

int main()
{
    cin >> n >> m;
    for(int i = 1; i <= n; i++)
    {
        cin >> a[i] >> b[i];
    }
    for(int i = 1; i <= n; i++)
    {
        for(int j = m; j >= 1; j--)
        {
            if (a[i] <= j)
                dp[j] = max(dp[j], dp[j - a[i]] + b[i]);
        }
    }
    cout << dp[m];
    return 0;
}