#include <fstream>
using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

const int N=5005, G=10005;
int n, g, sol, w[N], v[N], dp[G];

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

    for(int i=1;i<=n;++i)
        for(int j=g-w[i];j>=0;--j)
            if(dp[j]+v[i]>dp[j+w[i]])
                dp[j+w[i]]=dp[j]+v[i], sol=max(sol, dp[j+w[i]]);
    fout<<sol;

    return 0;
}