#include <iostream>
#include <fstream>

using namespace std;

ifstream in("rucsac.in");
ofstream out("rucsac.out");

int n,g,w,p,a[5005][10005];

int main()
{
    in>>n>>g;
    for(int i=1;i<=n;i++)
    {
        in>>w>>p;
        for(int j=1;j<=g;j++)
        {
            if(w>j) a[i][j]=a[i-1][j];
                else a[i][j]=max(p+a[i-1][j-w],a[i-1][j]);
        }
    }
    out<<a[n][g];
    return 0;
}