#include <fstream>

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int a[5001],b[5001],v[10001],n,s,i,j,mx;

int main()
{
    f>>n>>s;
    for(i=1;i<=n;i++)f>>a[i]>>b[i];
    for(i=1;i<=n;++i)
    for(j=s-a[i];j>=0;--j)
        if(v[j+a[i]]<v[j]+b[i])
        {
            v[j+a[i]]=v[j]+b[i];
            if(v[j+a[i]]>mx)mx=v[j+a[i]];
        }
    g<<mx;
    return 0;
}