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#include <fstream>
#define NMAX 5002
#define GMAX 10002
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int N,G,W[NMAX],P[NMAX],dp[GMAX];
/// dp[greutate]=pret maxim
void citire()
{
fin>>N>>G;
for(int i=1; i<=N; i++)
{
fin>>W[i]>>P[i];
}
}
int main()
{
citire();
dp[0]=0;
for(int i=1; i<=N; i++)
{
for(int j=G-W[i]; j>=0; j--)
{
if(dp[j]+P[i]>dp[j+W[i]])
{
dp[j+W[i]]=dp[j]+P[i];
}
}
}
int ans=0;
for(int i=0; i<=G; i++)
{
ans=max(ans,dp[i]);
}
fout<< ans << "\n";
return 0;
}