#include<iostream>
#include<fstream>

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

#define nrm 5010
int n,gmax,maxim=0;
int greutate[nrm],profit[nrm],dp[10010];

void citire()
{
    fin>>n>>gmax;
    for(int i=1;i<=n;i++)
    {
        fin>>greutate[i]>>profit[i];
    }
}

int main ()
{
    citire();
    for(int i=1;i<=n;i++)
    {
        for(int j=gmax-greutate[i];j>=0;j--)
        {
            if(dp[j+greutate[i]]<dp[j]+profit[i])
            {
                dp[j+greutate[i]]=dp[j]+profit[i];
            }
        }
    }
    for(int i=1;i<=gmax;i++)
    {
        maxim=max(maxim,dp[i]);
    }
    fout<<maxim;
    fin.close();
    fout.close();
    return 0;
}