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Problem C: 变量与输入1-小明买可乐

Problem C: 变量与输入1-小明买可乐

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 40  Solved: 32
[Status] [Submit] [Creator:]

Description

超市出售可乐,售价3元一瓶,小明买了n瓶,请问要付多少钱?

Input

一个整数n(0<=n<=10000)

Output

n乘3以后的结果

Sample Input Copy

7

Sample Output Copy

21