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#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,gmx,i,val[20001],q[10001],v[10001],x,y,mx,j,sol;
int main()
{
f>>n>>gmx;
for(i=1;i<=n;i++)
f>>q[i]>>v[i];
for(i=1;i<=n;i++)
for(j=mx;j>=0;j--)
{
if(val[j+q[i]]<val[j]+v[i]&&j+q[i]<=gmx&&(!j||val[j]))
{
val[j+q[i]]=val[j]+v[i];
if(q[i]+j>mx) mx=q[i]+j;}
}
sol=0;
for(i=0;i<=gmx;i++)
if(sol<val[i]) sol=val[i];
g<<sol;
return 0;
}