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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, g;
int G[10001],c[10001];
int cmax[5001];
int main()
{
fin>>n>>g;
for(int i=1;i<=n;++i){
fin>>G[i]>>c[i];
}
for(int i=1;i<=n;++i){
for(int x=g;x;--x){
if(x>=G[i]){
if(cmax[x]<c[i]+cmax[x-G[i]]){
cmax[x]=c[i]+cmax[x-G[i]];
}
}
}
}
fout<<cmax[g];
return 0;
}