#include using namespace std; using Int = long long; template inline void chmin(T1 &a,T2 b){if(a>b) a=b;} template inline void chmax(T1 &a,T2 b){if(a>n>>k; vector a(n); for(Int i=0;i>a[i]; Int ans=0; for(Int b=0;b<(1<>i)&1) res+=a[i]; if(res<=k) chmax(ans,res); } cout<