#include <stdio.h>
int p[100001];
int a[100001];
int get_max(int a, int b) {
return a > b ? a : b;
}
int get_min(int a, int b) {
return a < b ? a : b;
}
int main() {
//freopen("input.txt", "rt", stdin);
int n;
scanf("%d", &n);
p[0] = 1;
p[2] = 3;
if (n % 2 != 0) {
printf("0");
return 0;
}
for (int i = 4; i <= n; i = i + 2) {
for (int j = 0; j <= i - 4; j++) {
p[i] += 2 * p[j];
}
p[i] += 3 * p[i - 2];
}
printf("%d", p[n]);
return 0;
}