#include <bits/stdc++.h>

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n,g,v[5005][10005];
struct per{
    int gr;
    int val;
}p[5005];
int main()
{
    in >> n >> g;
    for(int i=1; i<=n; i++)
    {
        in >> p[i].gr >> p[i].val;
    }
    for(int i=1; i<=n; i++)
    {
        for(int j=0; j<=g; j++)
        {
            if(p[i].gr>j)
            {
                v[i][j]=v[i-1][j];
            }
            else
            {
                v[i][j]=max(v[i-1][j],v[i-1][j-p[i].gr]+p[i].val);
            }
        }
    }
    out << v[n][g];
    return 0;
}