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