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