#include <cstdio>
int a[1005];
int main(){
	freopen("nunta.in","r",stdin);
	freopen("nunta.out","w",stdout);
	int n,i;
	scanf("%d",&n);
	a[1]=1;
	a[2]=2;
	for(i=3;i<=n;++i)
		a[i]=1+(a[i-1]-1)*2;
	printf("%d",a[n]);
}