GACHO C++

#include<bits/stdc++.h>
using namespace std;
int n,d;

int main()
{
    freopen("GACHO.inp","r",stdin);
    freopen("GACHO.out","w",stdout);
    scanf("%d",&n);
    d=0;
    for(int i=0;i<=n/2;i++)
   if ((n-2*i)%4==0) d++;
    printf("%d",d);
}