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#include <fstream>
#define NMAX 5005
#define GMAX 10005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int N,G,W[NMAX],P[NMAX],dp[GMAX];
void citire()
{
fin>>N>>G;
for(int i=1; i<=N; i++)
{
fin>>W[i]>>P[i];
}
}
int main()
{
citire();
int ans=-1;
for(int i=1; i<=N; i++)
{
for(int j=G-W[i]; j>=1; j--)
{
if(dp[j])
{
dp[j+W[i]]=max(dp[j]+P[i],dp[j+W[i]]);
ans=max(ans,dp[j+W[i]]);
}
}
dp[W[i]]=P[i];
}
fout<< ans << "\n";
return 0;
}