View Code of Problem 73

#include<stdio.h>
#include<math.h>
int main()
{
	int n,m,i;
	scanf("%d",&n);
	m=1;
	for(i=1;i<n;i++)
	{
		m=(m+1)*2;
	}
    printf("%d\n",m);
	return 0;
}