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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,x,maxim,k,minim,i1,i,g1,g;
int d[10004];
int main()
{
fin>>n>>g1;
for(int i=1;i<=n;i++)
d[i]=-1;
for(int i=1;i<=n;i++)
{
fin>>g>>x;
for(int j=g1;j>=0;j--)
if(d[j]!=-1 && g+j<=g1)
{
d[j+g]=max(d[j+g],d[j]+x);
}
}
fout<<d[1];
return 0;
}