题目描述
Rajiv is given a problem in class.
" Suppose N burnt candles together make a new candle. then how many new candles are created if we start with M candles"
Please refer to similar MCQ Question for clarification.
SAMPLE INPUT
121
SAMPLE OUTPUT
30
输入格式
见题面
输出格式
见题面
样例输入
121
SAMPLE
样例输出
30