#include <bits/stdc++.h>

using namespace std;

vector<pair<int,int> > o(5001);
int d[10001][5001];

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);

    int n,g;
    cin>>n>>g;
    for(int i=0;i<n;++i) cin>>o[i].first>>o[i].second;
    for(int i=1;i<=g;i++)
    {
        if(o[0].first<=i)
        d[i][0]=o[0].second;
    }
    for(int j=1;j<n;j++)
    {
        for(int i=1;i<=g;i++)
        {
            if(o[j].first<=i)
            {
                if(d[i-o[j].first][j-1]+o[j].second>d[i][j-1])
                {
                    d[i][j]=d[i-o[j].first][j-1]+o[j].second;
                }
                else d[i][j]=d[i][j-1];
            }
        }
    }
    cout<<d[g][n-1];
    return 0;
}