#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int n, gr[1010], co[1010], gmax, a[1010][1010];

int main()
{
    int i, j;
    fin>>n>>gmax;
    for(i=1; i<=n; i++)
        fin>>gr[i]>>co[i];

    for(i=1; i<=n; i++)
    {
        for(j=1; j<=gmax; j++)
        {
            if(j-gr[i]>=0)
            {
                if(co[i]+a[i-1][j-gr[i]]>a[i-1][j])
                    a[i][j]=co[i]+a[i-1][j-gr[i]];
                else
                    a[i][j]=a[i-1][j];
            }
            else
                a[i][j]=a[i-1][j];
        }
    }
    fout<<a[n][gmax];

    fin.close();
    fout.close();
    return 0;
}