#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
struct x
{
    int greutate,pret;
}v[5001];
int dp[2][10001];
int main()
{
    int n,G,i,j;
    cin>>n>>G;
    for(i=1;i<=n;i++)
    {
        cin>>v[i].greutate>>v[i].pret;
        for(j=v[i].greutate;j<=G;j++)
            dp[2][j]=max(dp[2][j],dp[1][j-v[i].greutate]+v[i].pret);
        for(j=0;j<=G;j++)
            dp[1][j]=dp[2][j];
    }
    cout<<dp[2][G];
    return 0;
}