#include <iostream>
#include <fstream>

using namespace std;

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

int n, g, gr[10005], pr[10005];
int dp[5005][10005];

void citire()
{
    fin>>n>>g;
    for(int i=1; i<=n; i++)
        fin>>gr[i]>>pr[i];
}

void parcurgere()
{
    for(int i=1; i<=n; i++)
        for(int j=1; j<=g; j++)
            if(gr[i]<=j)
            {
                if(dp[i-1][j-gr[i]]+pr[i]>=dp[i-1][j])
                    dp[i][j]=dp[i-1][j-gr[i]]+pr[i];
                else
                    dp[i][j]=dp[i-1][j];
            }
    fout<<dp[n][g];
}

int main()
{
    citire();
    parcurgere();
    /**
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=g; j++)
            fout<<dp[i][j]<<" ";
        fout<<"\n";
    }
    **/
    return 0;
}