#include <cstdio>
int n, g, optim[10100], w[5010], p[5010];
void citire()
{
    int i;
    scanf("%d%d", &n, &g);
    for(i=1;i<=n;++i)
        scanf("%d%d", &w[i], &p[i]);
}
void rezolva_problema()
{
    citire();
    int i, j;
    optim[0]=0;
    int sol=0;
    for(i=1;i<=n;++i)
        for(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\n", sol);
}
int main()
{
    freopen("rucsac.in", "r", stdin);
    freopen("rucsac.out", "w", stdout);
    rezolva_problema();
    return 0;
}