#include<stdio.h>

#define ll long long

ll s,n,sum,val;

int main ()
{
    int i;

   // freopen("a.in","r",stdin);
   // freopen("a.out","w",stdout);

    scanf("%lld",&n);
    s = (ll)n * (n + 1) / 2;
    sum = s;
    s = s / 2;
    //sp = s;
    for(i = n; i >= 1; i--)
        if(i <= s)
        {
            s -= i;
            val += i;
        }
    printf("%lld\n", 15 + sum - 2 * val);
    return 0;
}