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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int v[10005],g[10005],n,gmax;
struct {
int gr,val;
}cit[5010];
int main()
{
bool ok=0;
fin>>n>>gmax;
for(int i=1;i<=n;i++)
{
fin>>cit[i].gr>>cit[i].val;
}
int i,j;
for(j=1;j<=n;j++)
{
if(ok==0)
{
for(i=1;i<=gmax;i++)
{
if(cit[j].gr<=i)
{
if(g[i-cit[j].gr]+cit[j].val>g[i])
{
v[i]=g[i-cit[j].gr]+cit[j].val;
}else
{
v[i]=g[i];
}
}else
{
v[i]=g[i];
}
}
ok=1;
}else
{
for(i=1;i<=gmax;i++)
{
if(cit[j].gr<=i)
{
if(v[i-cit[j].gr]+cit[j].val>v[i])
{
g[i]=v[i-cit[j].gr]+cit[j].val;
}else
{
g[i]=v[i];
}
}else
{
g[i]=v[i];
}
}
ok=0;
}
}
if(n%2==0)
{
fout<<g[gmax];
}else
{
fout<<v[gmax];
}
return 0;
}