#include <iostream> #include <cstdio> #include <cmath> #include <iomanip> using namespace std; double EPS=0.00001; int main(){ double a,x,y; cin>>a; x=a/2; y=(x+a/x)/2; if(abs(x-y)>0.00001){ x=a/2; y=(x+a/x)/2; } cout<<fixed<<setprecision(3)<<y<<endl; return 0; } |
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