#include <bits/stdc++.h> using namespace std; double a,b,c,d,e,f; int main() { cin>>a>>b>>c>>d; e=1/(1/a+1/b); f=1/(1/a+1/b+1/c+1/d); printf("%.2f",e); cout<<endl; printf("%.2f",f); return 0; }