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#include<fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int v[10001];
int main(){
int G,n;
cin>>n>>G;
for(int i=1;i<=G;i++)
v[i]=-1;
for(int i=1;i<=n;i++){
int g,p;
cin>>g>>p;
for(int j=G-g;j>=0;j--){
if(v[j]!=-1)
v[j+g]=max(v[j]+p,v[j+g]);
}
}
int sol=-1;
for(int i=0;i<=G;i++){
sol=max(sol,v[i]);
}
cout<<sol;
}