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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, g;
int G[5001],c[10001];
int cmax[10001];
int main()
{
fin>>n>>g;
for(int i=1; i<=n; ++i)
{
fin>>G[i]>>c[i];
}
for(int i=1; i<=n; ++i)
{
for(int x=g; x; --x)
{
if(x>=G[i])
{
if(cmax[x]<c[i]+cmax[x-G[i]])
{
cmax[x]=c[i]+cmax[x-G[i]];
}
}
}
}
fout<<cmax[g];
return 0;
}