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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int main()
{
int profit[10001],i,j,n,k,pmax=0,p[5001],g[5001];
in>>n>>k;
for(i=0; i<n; i++)
{
in>>g[i]>>p[i];
}
for(j=1; j<=k; j++)
{
profit[j]=-1;
}
profit[0]=0;
for(i=0; i<n; i++)
{
for(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];
}
}
}
for(j=1; j<=k; j++)
{
if(profit[j]>pmax)
pmax=profit[j];
}
out<<pmax;
in.close();
out.close();
return 0;
}