# include<list> # include<iostream> using namespace std; int main(){ int a=10000,b=10000; int n; cin>>n; for(int i=3;i<=n;i++){ if(i%2==1){ a=a-1; } else{ b-=2; } } if(n%2==0){ cout<<a; } else{ cout<<b; } return 0; }