#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int m[2][10005], i, j, n, G, w[5005], p[5005], pmax;

int main()
{   f>>n>>G;
    for(i=1;i<=n;i++)
        f>>w[i]>>p[i];

    for(i=1;i<=n;i++)
    {   for(j=1;j<=G;j++)
            if(w[i]<=j)
                m[i%2][j]=max(m[!(i%2)][j],m[!(i%2)][j-w[i]]+p[i]);
            else m[i%2][j]=m[!(i%2)][j];
        pmax=max(pmax,m[i%2][G]);
    }
    g<<pmax;
    return 0;
}