#include <iostream>
#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int a[1005][1005];
int w[10001],p[10001];
int main()
{
    int N,G,i,j,Pmax=0;
    fin>>N>>G;
    for(i=1; i<=N; i++)
    {
        fin>>w[i]>>p[i];
    }
    for(i=1; i<=N; i++)
    {
        for(j=1; j<=G; j++)
        {
            a[i][j]=a[i-1][j];
            if(w[i]<=j)
            {
                a[i][j]=max(a[i-1][j],a[i-1][j-w[i]]+p[i]);
            }
        }
    }
    Pmax=a[N][G];
    fout<<Pmax;
    fin.close();
    fout.close();
    return 0;
}