#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int v[1001], p[1001];
int f[50001];
int n, sol, i, j, G, sMaxim;
int main () {
    cin>>n>>G;
    for (i=1;i<=n;i++){
        cin>>v[i]>>p[i];
    }
    for (i=1;i<=n;i++){
        for (j=G;j>=1;j--){
            if (f[j]!=0){
                if (j+v[i]<=G && f[j]+p[i]>f[j+v[i]])
                        f[j+v[i]]=f[j]+p[i];

            }
        }
        if (v[i]<=G && p[i]>f[v[i]])
            f[v[i]]=p[i];
    }
    for (i=1;i<=G;i++){
        sol=max(sol, f[i]);
    }
    cout<<sol;
}