#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int i, j, n, g, v[5001], p[5001], a[10001], m;

int main(){
    fin>>n>>g;
    for(i=1; i<=n; i++)
        fin>>v[i]>>p[i];

    for(i=1; i<=n; i++){
        for(j=g; j>=0; j--)
            if(  (a[j]!=0 || j==0) && (j+v[i]<=g) && (a[j]+p[i]>a[j+v[i]])){
                a[j+v[i]] = a[j] + p[i];
                if(m<a[j+v[i]])
                    m=a[j+v[i]];
            }
    }
    fout<<m;


    return 0;
}