#include #define rep(i,n) for (int i=0; i < (n); i++) using namespace std; using ll = long long; int main(){ ios::sync_with_stdio(false); double a,b,c,d,e,f; cin>>a>>b>>c>>d>>e>>f; cout << std::fixed << std::setprecision(15); double r = f - e + (c*c)/(4*a*a) + (d*d)/(4*b*b); r = sqrtl(r); cout << r << endl; }