import math
def main():
    print(math.sqrt(5))
    #print(math.sqrt(-5))
    print(math.floor(-3.7))
    print(math.ceil(3.7))
    print(math.ceil(-3.7))
    print("The value of pi is: ", math.pi)
    print("The value of cos(pi) is: ", math.cos(math.pi))

main()
