#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,k,a,q; q=10000; cin>>i; if(i%2==0){ k=2; } else{ k=1; } for(a=2;a<=i/2;a++){ q=q-k; } cout<<q; return 0; }