#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int g[5001],p[5001],o[10001];
int main()
{
    int n,i,j,s=0,gr;
    fin>>n>>gr;
    for(i=1;i<=n;i++)
        fin>>g[i]>>p[i];
    for(i=1;i<=n;i++)
        for(j=gr-g[i];j>=0;j--)
            if(o[j+g[i]]<o[j]+p[i])
            {
                o[j+g[i]]=o[j]+p[i];
                if(o[j+g[i]]>s)s=o[j+g[i]];
            }
    fout<<s;
    return 0;
}