#include <fstream>
#include <iomanip>
using namespace std;
ifstream is ("rucsac.in");
ofstream os ("rucsac.out");

int n, g, s;
int a[10001], P[5001], G[5001];
void Read();
int main()
{
    Read();
    a[0] = 0;
    for(int i = 1; i <= n; ++i)
        for(int j = g - G[i]; j >= 0; --j)
        {
            if(a[j + G[i]] < a[j] + P[i])
            {
                a[j + G[i]] = a[j] + P[i];
                s = max(s, a[j + G[i]]);
            }
        }
    os << s;

    return 0;
}
void Read()
{
    is >> n >> g;
    for(int i = 1; i <= n; ++i)
        is >> G[i] >> P[i];
}