#include <iostream>
#include <fstream>
using namespace std;

int n,g,act=0;
int v[10010];
int main()
{
    ifstream fin("rucsac.in");
    ofstream fout("rucsac.out");
    fin>>n>>g;
    int x,c,p;
    while(n)
    {
        fin>>c>>p;
        for(int i=g-c;i>=0;i--)
            if(v[i])
                v[i+c]=max(v[i+c],v[i]+p);
        v[c]=max(v[c],p);
        act=!act;
        n--;
    }
    fout<<v[g];
    return 0;
}