View Code of Problem 73

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<malloc.h>

int main(){
	int n;
	scanf("%d", &n);
	int x = 1;
	for (int i = 1;i < n;i++) {
		x = (x + 1) * 2;
	}
	printf("%d", x);
	

}