#include <iostream>
#include <cstdio>

using namespace std;
int Poz[10001],G[10001],val[10001],N,Gmx,i,j;
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    cin>>N>>Gmx;
    for(i=1;i<=N;i++)
        cin>>Poz[i]>>G[i];
    for(i=1;i<=N;i++)
    {
        for(j=Gmx;j>=Poz[i];j--)
        {
            val[j]=max(val[j],val[j-Poz[i]]+G[i]);
        }
    }
    cout<<val[Gmx];
    return 0;
}