#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gmax,a[5010][10010],i,gr[5010],val[5010],j,x;
int main()
{
    fin>>n>>gmax;
    for(i=1;i<=n;i++)
    {
        fin>>gr[i]>>val[i];
    }
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=gmax;j++)
        {
            if(gr[i]>j)
            {
                a[i][j]=a[i-1][j];
            }
            else
            {
                x=a[i-1][j-gr[i]]+val[i];
                if(x>a[i-1][j])
                {
                    a[i][j]=x;
                }
                else
                {
                    a[i][j]=a[i-1][j];
                }
            }
        }
    }
    fout<<a[n][gmax];
    return 0;
}