View Code of Problem 73

#include <stdio.h>
#include <string.h>
#include <math.h>
#define N 100
int main()
{
	int n, i;
	int sum = 1;
	scanf("%d", &n);
	for (i = 1; i < n; i++)
	{
		sum = (sum + 1) * 2;
	}
	printf("%d", sum);

	

}