Submission #2233672

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

#define REP(i,m) for(long long i=0; i<m; i++)
#define FOR(i,n,m) for(long long i=n; i<m; i++)
#define INF 1000000000
#define INFL 10000000000000000LL
#define ALL(v) v.begin(),v.end()
#define pb push_back
#define ll long long int
#define P pair<ll, ll>

int main() {
  double x, y, z;
  cin >> x >> y >> z;
  double h = pow(x*x+y*y, 0.5);
  cout << fixed << setprecision(16) << 2*z*x/(h+z) << endl;
  return 0;
}

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