View Code of Problem 73

#include<stdio.h>
#include<string.h>
#include<math.h>
#define MAX 1000000+10
#define Max(a,b) a>b?a:b
#define Min(a,b) a<b?a:b
int main()
{
	int n;
	scanf("%d",&n);
	int sum=1;
	int i;
	for(i=1;i<n;i++)
	{
		sum=(sum+1)*2;
	}
	printf("%d\n",sum);

}