#! /usr/bin/env python

def greet():
    print('Hello, Bioinformatics')

def greet1(name: str) -> None:
    print(f'Hello, {name}')

def greet2(num: int) -> int:
    return num*2

greet()
ret1 = greet1('zion')
print(ret1)

ret2=greet2(3)
print(ret2)
