c语言喝汽水

#include<stdio.h>


int main() 
{
	int n = 0;
	int sum = 0;
	int empty = 0;
	scanf("%d", &n);
	sum = n;
	empty = n;
	while (empty > 1)
	{
		sum = sum + empty / 2;
		empty=empty%2 + empty / 2;

	}
	printf("%d", sum);

	return 0;
}