#include <cstdio>

using namespace std;
int w[5001],p[5001];
int d[10000];
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    int n,g,i,j;
    scanf("%d%d",&n,&g);
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&w[i],&p[i]);
    }
    d[0]=1;
    for(i=1;i<=n;i++)
    {
        for(j=g;j>=0;j--)
        {
            if(d[j]!=0&&j+w[i]<=g)
            {
                if(d[j+w[i]]<d[j]+p[i])
                    d[j+w[i]]=d[j]+p[i]-(j==0);
            }
        }
    }
    printf("%d",d[g]);
    return 0;
}