- #include <iostream> 
- using namespace std; 
-   
- int main()  
- { 
-     double v0, m, R, G, h; 
-     cin>>v0>>R>>m; 
-     G=6.67408*1e-11; 
-     h=(v0*v0*R*R)/(2*m*G);  
-     cout<<h<<endl; 
-     return 0; 
- } 
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