SOlution of 11877 - The Coco-Cola Store

Problem Description
source:https://uva.onlinejudge.org/external/118/11877.html

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

Solution:

#include<stdio.h>

int main()
{
    int n, get;
    while(scanf("%d",&n)==1)
    {
        if(n==0)
            break;
        get=0;
        while(n>=3)
        {
           /* get+=n/3;
            n=n/3+n%3;*/
            n=(n-3)+1;
            get+=1;

        }
        if(n==2)
            get+=1;
        printf("%d\n",get);
    }
    return 0;
}