#include<iostream>
main(){int n;std::cin>>n;std::cout<<(n-1)/2;}
Codeforces Round #411 (Div. 2), problem: (C) Find Amir Solution In C/C++
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Drawing A Hollow Rectangle Using JavaOctober 29, 2016 0
, problem: (C) Find Amir Solution In C/C++){kind=link}
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#include<iostream>
main(){int n;std::cin>>n;std::cout<<(n-1)/2;}