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#include <fstream>
using namespace std;
int n, g, w, p, i, j;
int v[5001];
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int main () {
fin>>n>>g;
for (i=1;i<=g;i++)
v[i]=-1;
for (i=1;i<=n;i++) {
fin>>w>>p;
for (j=g-w;j>=0;j--) {
if (v[j]!=-1) {
if (v[j+w]<v[j]+p)
v[j+w]=v[j]+p;
}
}
}
fout<<v[g];
return 0;
}