#include <iostream>
#include <fstream>

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

struct rucsac{
int w, p;
}a[5005];
int n, G;
int dp[3][10005];

void print()
{
    for (int i = 0; i <= n; i++)
    {
        for (int j = 1; j <= G; j++)
            cout << dp[i][j] << " ";
        cout << '\n';
    }
    cout << '\n';
}

int main()
{
    f >> n >> G;
    for (int i = 1; i <= n; i++)
        f >> a[i].w >> a[i].p;
    int l = 0;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= G; j++)
            if(j-a[i].w>=0)
            dp[l][j]=max(dp[1-l][j], dp[1-l][j-a[i].w]+a[i].p);
        l=1-l;
    }
    g << dp[1-l][G] << '\n';

    return 0;
}