#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,a=10000,b=10000; cin>>n; for(int i=3;i<=n;i++){ if(i%2==0) b-=2; else a-=1; } if(n%2==0){ cout<<b; } else{ cout<<a; } return 0; }