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#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
struct obiecte
{
int w,p;
}v[5001];
int n,gg,i,l,q,d[3][10001],gr;
int main()
{
f>>n>>gg;
for(i=1;i<=n;i++)
f>>v[i].w>>v[i].p;
d[0][v[1].w]=v[1].p;
l=1;
for(q=2;q<=n;q++)
{
for(gr=1;gr<=gg;gr++)
{
if(gr>=v[q].w)d[l][gr]=max(d[1-l][gr],d[1-l][gr-v[q].w]+v[q].p);
else d[l][gr]=d[1-l][gr];
}
l=1-l;
}
g<<d[1-l][gg];
return 0;
}