#include<bits/stdc++.h> using namespace std; int main(){ int sum,a,b; cin>>sum; if(sum%2==1){ a=sum/2+1; int count=10000; for(int i=1;i<=a-1;i++){ count--; }cout<<count; }else{ int count=10000; b=sum/2; for(int i=1;i<=b-1;i++){ count-=2; }cout<<count; } }