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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int D[100],g[100],v[100];
int n,G,sol;
int main(){
fin>>n>>G;
for(int i=1;i<=n;i++){
fin>>g[i]>>v[i];
}
for(int i=1;i<=n;i++){
D[i]=-1;
}
D[0] = 0;
for(int i=1;i<=n;i++){
for(int j=G;j>=0;j--){
if(D[j]!=-1 && j+g[i]<=G && D[j+g[i]]<D[j]+v[i]){
D[j+g[i]]=D[j]+v[i];
}
}
}
for(int i=0;i<=G;i++){
if(sol<D[i]){
sol=D[i];
}
}
fout<<sol;
}