- #include <iostream> 
- #include <cstdio> 
- #include <cmath> 
-   
- void reverse() 
- { 
- 	double x; 
- 	if (scanf("%lf", &x) > 0) 
- 	{ 
- 		reverse(); 
- 		printf("%.4f\n", sqrt(x)); 
- 	} 
- } 
-   
- int main() 
- { 
- 	reverse(); 
- 	return 0; 
- } 
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