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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int sol,n,G,w[10001],p[10001],d[10001];
int main(){
fin>>n>>G;
for(int i=1;i<=n;i++){
fin>>w[i]>>p[i];
}
d[0]=1;
for(int i=1;i<=n;i++){
for(int j=G;j>=0;j--){
if(d[j]&&j+w[i]<=G){
d[j+w[i]]=max(d[j]+p[i],d[j+w[i]]);
sol=max(sol,d[j+w[i]]);
}
}
}
fout<<sol-1;
}