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#include <cstdio>
#include<algorithm>
using namespace std;
const int DMAX=10005;
int d[DMAX];
int main()
{
freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
int n,gmax,p,i,dr,g,j,pmax;
scanf("%d%d",&n,&gmax);
for(i=1; i<=gmax; i++)
d[i]=-1;
dr=pmax=0;
for(i=1; i<=n; i++)
{
scanf("%d%d",&g,&p);
for(j=dr; j>=0; j--)
{
if(j+g<=gmax)
if(d[j+g]<d[j]+p)
{
d[j+g]=d[j]+p;
if(j+g>dr)
dr=j+g;
}
}
}
for(i=1; i<=gmax; i++)
if(d[i]>pmax)
pmax=d[i];
printf("%d",pmax);
return 0;
}