#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int gr[5005], pr[5005], a[3][10005];
int main()
{
    int i,j,n,G;
    fin>>n>>G;
    for(i=1;i<=n;i++)
    {
        fin>>gr[i]>>pr[i];
    }
    for(i=1;i<=n;i++)
    {
        int c=i%2;
        for(j=1;j<=G;j++)
        {
            a[c][j]=a[1-c][j];
            if(gr[i]<=j)
                a[c][j]=max(a[1-c][j], a[1-c][j-gr[i]]+pr[i]);
        }
    }
    fout<<a[n%2][G];
    return 0;
}