#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 i; int j=10000; int o=10000; int n; cin>>n; if(n%2==1){ cout<<j-(n-1)/2<<endl; } else{ cout<<o-(n-2)<<endl; } return 0; }