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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int N, G, Pmax, W[5005], P[5005], D[5][10005];
int main()
{
f>>N>>G;
for(int i=1; i<=N; i++)
f>>W[i]>>P[i];
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];
f.close();
g.close();
return 0;
}