#include <bits/stdc++.h>

#pragma optimize GCC ("Ofast")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

///#include <tryhardmode>
///#include <GODMODE::ON>

using namespace std;

#define int long long

#define cin fin
#define cout fout

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

const int INF=-2e9;
const int NMAX=5e3+5;
const int GMAX=1e4+5;

int dp[GMAX];

struct elem{
    int g;
    int val;
}v[NMAX];

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int n,m,i,j,greu,best=0;
    cin>>n>>greu;
    for(i=1;i<=greu;i++)
        dp[i]=INF;
    dp[0]=0;
    for(i=1;i<=n;i++)
        cin>>v[i].g>>v[i].val;
    for(i=1;i<=n;i++)
    {
        for(j=greu;j>=0;j--)
        {
            if(j+v[i].g>greu || dp[j]==INF)
                continue;
            else
            {
                if(dp[j+v[i].g]<dp[j]+v[i].val)
                {
                    dp[j+v[i].g]=dp[j]+v[i].val;
                    best=max(best,dp[j+v[i].g]);
                }
            }

        }
    }
    cout<<best;
    return 0;
}