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#include <fstream>
#define dim 100005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,i,g,j,d[dim],a,b,maxim;
int main(){
fin>>n>>g;
for(i=1;i<=g;i++){
d[i]=-1;
}
for(i=1;i<=n;i++){
fin>>a>>b;
for(j=g-a;j>=0;j--){
if(d[j+a]<d[j]+b && d[j]!=-1 ){
d[j+a]=d[j]+b;
}
}
}
for(i=1;i<=g;i++){
maxim=max(d[i],maxim);
}
fout<<maxim<<"\n";
return 0;
}