- #include <iostream> 
- #include <iomanip> 
- #include <cmath> 
- using namespace std; 
-   
- int main()  
- { 
- 	int x1, y1; 
- 	int x2, y2, z2; 
- 	cin >> x1 >> y1; 
- 	cin >> x2 >> y2 >> z2; 
- 	double D = 1/sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1) + z2*z2); 
- 	cout << fixed << setprecision(3) << D << endl; 
- 	return 0; 
- } 
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