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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gmax,s,uz[301][101],i,j,cmax[301],g[101],c[101];
int main()
{
fin>>n>>gmax;
for(i=1;i<=n;i++)
fin>>g[i];
for(i=1;i<=n;i++)
fin>>c[i];
for(i=1;i<=gmax;i++)
cmax[i]=-1;
for(s=1;s<=gmax;s++)
for(i=1;i<=n;i++)
if(g[i]<=s&&cmax[s-g[i]]!=-1&&!uz[s-g[i]][i])
if(cmax[s]<cmax[s-g[i]]+c[i])
{
cmax[s]=cmax[s-g[i]]+c[i];
for(j=1;j<=n;j++)
uz[s][j]=uz[s-g[i]][j];
uz[s][i]=1;
}
if(cmax[gmax]==-1)
fout<<"IMPOSIBIL";
else
{
fout<<cmax[gmax]<<endl;
for(i=1;i<=n;i++)
if(uz[gmax][i]==1)
fout<<i<<" ";
}
return 0;
}