#include<iostream> using namespace std; int main(){ int n,a=10000,b=10000; cin>>n; //n,奇数项有多少？n是奇数,奇数项有n/2+1,n是偶数n/2 for(int i=3;i<=n;i+=2){ a-=1; } //if(n%2==1&&n!=1) a--; //cout<<a; for(int i=4;i<=n;i+=2){ b-=2; } //cout<<b<<endl; if(n%2==1) cout<<a<<endl; else cout<<b<<endl; return 0; }