#include <iostream>
#include <fstream>
#include <algorithm>
#include <bitset>
using namespace std;
fstream fin("rucsac.in",ios::in),fout("rucsac.out",ios::out);
struct elemente{int w,p;};
elemente x[5002];
int sc[1000];
int n,g;
int main()
{
    int i,a,j,r,total=0,b;
    fin>>n>>g;
    for(i=1;i<=n;i++)
    {
        fin>>a>>b;
        for(j=g;j>=a;j--)
        {
            sc[j]=max(sc[j],sc[j-a]+b);
        }
    }
    fout<<sc[g]<<"\n";
    fout.close();
    fin.close();
    return 0;
}