#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>

using namespace std;

int main() {
	int n;
	scanf("%d", &n);
	int fler = 15;
	int step;
	int sum = 0;
	if (n%2== 0 && (n/2)%2 ==0) {
		printf ("15\n");
	} else {
		for (int i = n; i>=1; i--)
			if (sum - i >= 0) {
				sum-=i;
			} else {
				sum+=i;
			}
		printf ("%d\n", fler+sum);
	}
	return 0;
}