#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 n,s; cin>>n; if(n%2==0){ s=10002-n; } else{ s=10001-(n+1)/2; } cout<<s; return 0; }