# Read numbers until a sentinel (an empty string), and return their sum.
# JMR 2018


def inputTotal():
   """Read numbers until empty string is entered and return the sum."""
   tot = 0.0
   while True:
      n = input("valor? ") # input("valor? ")
      if n == '': return tot
      tot += float(n)

# MAIN PROGRAM
def main():
   tot = inputTotal()
   print(tot)

if __name__ == "__main__":
   main()