#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
#define MAXN 5010
#define MAXG 10010

int N, G, Pmax;
int W[MAXN], P[MAXN];
int D[MAXN][MAXG];
int main()
{
    fin>>N>>G;
    for(int i=1;i<=N;++i)
        fin>>W[i]>>P[i];
    for(int i=1;i<=N;++i)
        for(int cw=1;cw<=G;++cw)
        {
            D[i][cw]=D[i-1][cw];
            if(W[i]<=cw)
                D[i][cw] = max(D[i][cw], D[i - 1][cw - W[i]] + P[i]);
        }
    fout<<D[N][G];
}