#include <cstdio>
#include <algorithm>
using namespace std;
#define Max 10001

int n,g,pr[Max];

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