#include<cstdio>
using namespace std;
#define nmax 5002
int W[nmax], P[nmax];
int Optim[2*nmax];
int main()
{
    freopen("rucsac.in", "r", stdin);
    freopen("rucsac.out", "w", stdout);
    int N, G;
    scanf("%d %d", &N, &G);

    for (int i = 1; i <= N; ++i)
        scanf("%d %d", &W[i], &P[i]);

    Optim[0] = 0;
    int sol = 0;

    for( int i = 1; i <= N; ++i)
        for( int j = G - W[i]; j >= 0; --j)
        {
            if( Optim[j+W[i]] < Optim[j] + P[i] )
            {
                Optim[j+W[i]] = Optim[j] + P[i];
                if( Optim[j+W[i]] > sol)
                    sol = Optim[j+W[i]];
            }
        }
    printf("%d", sol);
    return 0;
}