#include<stdio.h>
int n;
int f(int a, int b){
	if (a>0 and a<n and a==b) return 0;
	if(a==n and b == n) return 1;
	if(a>=n or b >= n) return 0;
	return f(a+1,b+1)+f(a+1,b+2)+f(a+1,b+3)+f(a+2,b+1)+f(a+2,b+2)+f(a+2,b+3)+f(a+3,b+1)+f(a+3,b+2)+f(a+3,b+3);
}
int main(){
	scanf("%d", &n);
	printf("%d",f(0, 0));
}