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#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
const int Nmax=5005,Gmax=10005;
int N,G,W[Nmax],P[Nmax];
int D[2][Gmax];
void read()
{
f>>N>>G;
for(int i=1;i<=N;i++)
f>>W[i]>>P[i];
}
void solve()
{
read();
int l=0;
for(int i=1;i<=N;++i,l=1-l)
{
for(int j=0;j<=G;++j)
{
D[1-l][j]=D[l][j];
if(W[i]<=j) D[1-l][j]=max(D[1-l][j],D[l][j-W[i]]+P[i]);
}
}
g<<D[l][G];
}
int main()
{
solve();
return 0;
}