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