#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int NMAX=10000;
int dp[NMAX+5];
int main()
{
    int n, gmax, i, j, last, valmax, g, p;
    fin>>n>>gmax;
    for(i=1;i<=gmax;i++)
        dp[i]=-1;
    last=0;
    valmax=0;
    for(i=1;i<=n;i++)
    {
        fin>>g>>p;
        for(j=last;j>=0;j--)
        {
            if(dp[j]!=-1)
            {
                 if(j+g>gmax)
                   continue;
                 dp[j+g]=max(dp[j+g], dp[j]+p);
                 last=max(last, j+g);
                 valmax=max(valmax, dp[j+g]);
            }
        }
    }
    fout<<valmax<<"\n";
    return 0;
}