View Code of Problem 73

#include<stdio.h>
#include<math.h>
int main()
{
	int n,i,j;
	int m,sum=1;
	int a1=1,a2=2,b;
	scanf("%d",&n);
	for(i=0;i<n-1;i++)
	{
		sum=(sum+1)*2;
	}
	printf("%d",sum);
	
}