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