# include<iostream> using namespace std; int main(){ int a1=10000,a2=10000,n,ao,aj; cin>>n; for(int i=3;i<=n;i++){ if(i%2==0){ //cout<<a2<<" "; a2=a2-2; } else{ //cout<<a1<<" "; a1=a1-1; } } if(n%2==0) cout<<a2; else cout<<a1; return 0; }