#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,a; cin>>n; if(n%2==0){ cout<<10000-(n/2-1)*2; } else{ cout<<10000-n/2; } return 0; }