#include<bits/stdc++.h> #define int long long using namespace std; double x, y, c; bool check(double l){ double a = sqrt(x*x-l*l), b = sqrt(y*y-l*l); return (a+b)*c < a*b; } signed main() { while (cin >> x >> y >> c) { double l=0, r=min(x, y); while (l <= r) { double mid = (l + r) / 2.; if (check(mid))l = mid+1e-4; else r = mid-1e-4; } cout << fixed << setprecision(3) << l << endl; } return 0; }