HW2_Q1

def miles_to_km_c(num=1):
    num = num * 0.6214
    return num


def main():
    miles = int(input("enter number"))
    if miles < 0:
        miles = miles_to_km_c()
    else:
        miles = miles_to_km_c(miles)
    print(str(miles)+" km")


main()