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#include <cstdio>
using namespace std;
int en[10000001];
int main()
{
freopen("energii.in","r",stdin);
freopen("energii.out","w",stdout);
int g,w,i,j,e,c,dr;
en[0]=0;
scanf("%d%d",&g,&w);
for (i=1;i<=10000000;i++)
en[i]=-1;
dr=0;
for (i=1;i<=g;i++){
scanf("%d%d",&e,&c);
for (j=dr;j>=0;j--)
if (j+e>=w)
if (en[j]!=-1)
if (en[j+e]<en[j]+c)
{
en[j+e]=en[j]+c;
if (j+e>dr)
dr=j+e;
}
}
i=w;
while (i<=10000000 && en[i]==-1)
i++;
printf("%d",en[i]);
return 0;
}