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#include <iostream>
#include <fstream>
using namespace std;
const int NMAX=5000,
GMAX=10000;
int W[NMAX+1], P[NMAX+1];
int D[GMAX+1];
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int main()
{
int N, G, Pmax=0, i;
f>>N>>G;
for(i=1; i<=N; ++i)
f>>W[i]>>P[i];
/// D[0]=0;
for(i=1; i<=N; i++)
for(int g=G-W[i]; g>=0; --g)
{
int cw=g+W[i],
cp=D[g]+P[i];
if(D[cw]<cp)
{
D[cw]=cp;
if(cp>Pmax)
Pmax=cp;
}
}
g<<Pmax;
f.close();
g.close();
return 0;
}