#include <iostream>
#include <fstream>

using namespace std;
//infoarena
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g ,w[5050], p[5050], v[10100],s ;
int main()
{
    fin>>n>>g;
    for(int i=1;i<=n;++i)
        fin>>w[i]>>p[i];

    v[0]=0;

    for(int i=1;i<=n;++i)
        for(int j=g-w[i];j>=0;--j)
            if(v[j+w[i]]<v[j]+p[i])
            {
                v[j+w[i]]=v[j]+p[i];
                if(v[j+w[i]]>s)
                    s=v[j+w[i]];
            }



    fout<< s;

    return 0;
}