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