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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int d[110000],g[5010],c[5010],n,i,G,maxim=-20000,j;
int main(){
fin>>n>>G;
for(i=1;i<=n;i++){
fin>>g[i]>>c[i];
}
for(i=1;i<=G;i++){
d[i]=-20000;
}
d[0]=0;
for(i=1;i<=n;i++){
for(j=G;j>=0;j--){
if(d[j]>=0 && j+g[i]<=G &&d[j+g[i]]<d[j]+c[i]){
d[j+g[i]]=d[j]+c[i];
}
}
}
for(i=G;i>=0;i--){
if(d[i]>maxim){
maxim=d[i];
}
}
fout<<maxim;
return 0;
}