#include <cstdio>
#include <cstring>
#include <algorithm>

#define Gmax 30005
#define INF 0x3f3f3f3f

using namespace std;
int DP[Gmax],N,G;

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);

    memset(DP,-INF,sizeof(DP));
    DP[0] = 0;

    scanf("%d%d",&N,&G);
    int gr,cost,Glim = 0;
    for(int i = 1; i <= N; ++i)
    {
        scanf("%d%d",&gr,&cost);
        for(int j = Glim; j >= 0; --j)
            if(DP[j + gr] < DP[j] + cost)
                DP[j + gr ] = DP[j] + cost;
        Glim = min(G,Glim + gr);
    }

    int best = 0;
    for(int i = 0; i <= G; ++i)
        if(best < DP[i])
            best = DP[i];

    printf("%d\n",best);

    return 0;
}