UVa 11877 The Coco-Cola Store Solution

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cctype>
#include<cmath>
#include<algorithm>
#include<set>
#include<queue>
#include<stack>
#include<list>
#include<iostream>
#include<fstream>
#include<numeric>
#include<string>
#include<vector>
#include<cstring>
#include<map>
#include<iterator>
#define pb push_back
#define file freopen("in.txt","r",stdin);
using namespace std;


int main(){
    int n;
    int coke=0;
    while(scanf("%d",&n)==1){
        if(n==0)
         
break;
        coke=0;
        while(n>=3){
         
n=n-3;
         
coke++;
            n+=1;
            }
    if(n==2)
        printf("%d\n",(coke+1));
    else
        printf("%d\n",coke);
    }
return 0;
}