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#include <fstream>
#include <bits/stdc++.h>
#define Gmax 10005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g;
vector< pair<int,int> > pr;
int d1[Gmax],d2[Gmax];
void Read()
{
int i,x,y;
fin>>n>>g;
for(i=1;i<=n;++i)
{
fin>>x>>y;
pr.push_back(make_pair(x,y));
}
}
int Dinamica()
{
int i;
for(i=pr[0].first;i<=g;++i)
d1[i]=pr[0].second;
for(i=1;i<n;++i)
{
pair<int,int> p=pr[i];
for(int j=1;j<=g;j++)
{
d2[j]=d1[j];
if(p.first<=j)d2[j]=max(d2[j],p.second+d1[j-p.first]);
}
for(int j=1;j<=g;++j)
d1[j]=d2[j];
}
return d2[g];
}
int main()
{
Read();
fout<<Dinamica();
return 0;
}