#include<iostream>
#include<fstream>
using namespace std;
fstream fin("rucsac.in",ios::in),fout("rucsac.out",ios::out);
int s[10010];
int main()
{
    int n,a,b,g,i,j;
    fin>>n>>g;
    for(i=1;i<=n;i++)
    {
        fin>>a>>b;
        for(j=g;j>=a;j--)
        {
            s[j]=max(s[j],s[j-a]+b);
        }
    }
    fout<<s[g]<<"\n";
    return 0;
}