The Coco-Cola Store

UVA11877

The Coco-Cola Store

Once upon a time, there is a special coco-cola store. If you return three empty bottles to the shop, you’ll get a full bottle of coco-cola to drink. If you have n empty bottles right in your hand, how many full bottles of coco-cola can you drink?

Input

There will be at most 10 test cases, each containing a single line with an integer n (1 ≤ n ≤ 100). The input terminates with n = 0, which should not be processed.

Output

For each test case, print the number of full bottles of coco-cola that you can drink.

Spoiler

Let me tell you how to drink 5 full bottles with 10 empty bottles: get 3 full bottles with 9 empty bottles, drink them to get 3 empty bottles, and again get a full bottle from them. Now you have 2 empty bottles. Borrow another empty bottle from the shop, then get another full bottle. Drink it, and finally return this empty bottle to the shop!

Sample Input

3

10

81

0

Sample output

1

5

40

题意：

3个空瓶子可以换1瓶可乐，输入告诉你会有多少空瓶子，输出回答可以换到多少可乐

方法一：

使用模拟的方法做：

代码：

#include"iostream"
using namespace std;
const int maxn=110;
int main()
{
    int ca,n;
    while(cin>>n&&n)
    {
        ca=0;
        while(n>2)
        {
            n-=3;
            ca++;
            n+=1;
        }
        if(n==2)
        {
            ca++;
        }
        cout<<ca<<endl;
    }

return 0;

}

方法二：
其实只要输出每次的n/2就可以了

代码

#include"iostream"
using namespace std;
int main()
{
   int n;
	while(cin>>n&&n)
	{
		if(n!=2)
     cout<<n/2<<endl;
		else
			cout<<1<<endl;
	}
	return 0;
}