A. How many?
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

A college club is going to host an ICPC styled contest for its college students. Each team should have exactly three participants. There will be $$$n$$$ teams. How many participants will there be in total?

Input

The only line of input contains an integer $$$n$$$ ($$$1 \le n \le 1000$$$) — denoting the number of teams that will be participating.

Output

Output the total number of participants.

Example
Input
1
Output
3