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#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
const int N=5001;
int n,k,profit[2*N],g[N],p[N];
int main()
{
in>>n>>k;
for(int i=1;i<=n;i++)
in>>g[i]>>p[i];
for(int i=1;i<=k;i++)
profit[i]=-1;
for(int i=1;i<=n;i++)
{
for(int j=k-g[i];j>=0;j--)
{
if(profit[j]!=-1 && profit[j]+p[i]>profit[j+g[i]])
profit[j+g[i]]=profit[j]+p[i];
}
}
int pmax=0;
for(int i=1;i<=k;i++)
pmax=max(pmax,profit[i]);
out<<pmax;
return 0;
}