#include <iostream>
#include <fstream>
#define nmax 5005
#define gmax 10005
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n, a[nmax][gmax],G, cst[nmax], gr[nmax];

void citire()
{
    int i;
    f>>n>>G;
    for(i=1; i<=n; i++)
    {
        f>>gr[i]>>cst[i];
    }
}

void rucsac()
{
    int i,j;
    for(i=1; i<=n; i++)
    for(j=0; j<=G; j++)
    {
        a[i][j]=a[i-1][j];
        if(gr[i]<=j)
        a[i][j]=max(a[i][j], a[i-1][j-gr[i]]+cst[i]);
    }
}

int main()
{
    citire();
    rucsac();
    g<<a[n][G];
    f.close();
    g.close();
    return 0;
}