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#include <fstream>
using namespace std;
int d[50005];
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main()
{
int n,g,i,j,c,v,mx=0;
fin>>n>>g;
for(i=1;i<=g;++i){
d[i]=-1;
}
for(i=1;i<=n;++i){
fin>>c>>v;
for(j=g-c;j>=0;--j){
if(d[j]!=-1 && (d[j+c]==-1 || d[j+c]<d[j]+v)){
d[j+c]=d[j]+v;
if(d[j+c]>mx){
mx=d[j+c];
}
}
}
}
fout<<mx;
return 0;
}