#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int D[2][10001];
int l=1,n,g,v[5001],w[5001];

void citire()
{
    fin>>n>>g;
    for(int i=1;i<=n;i++)
        fin>>w[i]>>v[i];
}

void rez()
{
    for(int i=1;i<=n;i++,l=1-l)
        for(int j=1;j<=g;j++)
            if(j-w[i]>=0)D[l][j]=(D[1-l][j]>D[1-l][j-w[i]]+v[i])?D[1-l][j]:D[1-l][j-w[i]]+v[i];
            else D[l][j]=D[1-l][j];
    fout<<D[1-l][g];
}
int main()
{
    citire();
    rez();
    return 0;
}