#include <cstdio>

int d[10001];

using namespace std;

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    int n,i,j,smax,max,g,h,p;
    scanf("%d%d",&n,&h);
    for(i=1;i<=n;++i)
        d[i]=-1;
    smax=0; max=0;
    for(i=1;i<=n;++i)
    {
        scanf("%d%d",&g,&p);
        for(j=smax;j>=0;--j)
        {
            if(d[j]!=-1 && j+g<=h)
            {
                if(d[j+g]<d[j]+p)
                {
                    d[j+g]=d[j]+p;
                    if(d[j+g]>max)
                        max=d[j+g];
                }
                if(j+g>smax)
                    smax=j+g;
            }
        }
    }
    printf("%d\n",max);
    return 0;
}