# include <iostream>
# include <cstdio>
using namespace std;
int i,j,n,g,w[5001],p[5001],v[10001];
int rucsac()
{
    for(i=1;i<=n;i++)
        for(j=g;j>=w[i];j--)
            v[j]=max(v[j],v[j-w[i]]+p[i]);
    return v[g];
}
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d%d",&n,&g);
    for(i=1;i<=n;++i)
        scanf("%d%d",&w[i],&p[i]);
    printf("%d\n",rucsac());
    return 0;
}