#include <fstream>
using namespace std;
int f[10010];
int v[50010];
int p[50010];
int n,i,j,g,sol;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
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&&f[v[i]]<p[i]) {
            f[v[i]]=p[i];
        }
    }
    for (i=1;i<=g;i++) {
        sol=max(sol,f[i]);
    }
    cout<<sol;
}