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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int n,g,w[5002],p[5002],d[2][10002];
int main ()
{
fin>>n>>g;
for(int i=1;i<=n;i++){
fin>>w[i]>>p[i];
}
int l=0;
for(int i=1;i<=n;i++){
l=1-l;
for(int j=1;j<=g;j++){
d[l][j]=d[1-l][j];
if(w[i]<= j)d[l][j]=max(d[l][j],d[1-l][j-w[i]]+p[i]);
}
}
fout<<d[l][g];
return 0;
}