#include using namespace std; using Int = long long; const char newl = '\n'; template inline void chmin(T1 &a,T2 b){if(a>b) a=b;} template inline void chmax(T1 &a,T2 b){if(a void drop(const T &x){cout< vector read(size_t n){ vector ts(n); for(size_t i=0;i>ts[i]; return ts; } struct Precision{ Precision(){ cout<>a>>b>>c>>d>>e>>f; assert(abs(a)==abs(b)); b/=a; c/=a; d/=a; e/=a; f/=a; a/=a; drop(sqrt(f-e+(c/2)*(c/2)+(d/2)*(d/2))); return 0; }