#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int d[3][10001];
int w[5001];
int p[5001];
int N,G;
int fara,cu;
int maxi(int a, int b)
{
    return a>b ? a:b;
}

int main()
{
    fin>>N>>G;
    for (int i=1;i<=N;i++)
        fin>>w[i]>>p[i];
    for (int i=1;i<=N;i++)
    {
        for (int j=1;j<=G;j++)
        {
            fara = d[1][j];
            cu = j>=w[i] ? d[1][j-w[i]]+p[i] : 0;
            d[2][j] = maxi(fara,cu);
        }
        for (int j=1;j<=G;j++)
            d[1][j] = d[2][j];
    }
    fout<<d[1][G];
    return 0;
}