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

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