# Read in and add up a vector of numbers.

def vector_sum(numbers):
    total = 0.0
    for number in numbers:
        total += number

    return total

alist = []           # A list of values, note, no size.

n = int( raw_input( "How many numbers are there " ) )

for i in range ( 1, n+1):
	alist += [float(raw_input("Enter number %d: " % (i) ) ) ]

print "Sum is " , vector_sum(alist) , "\n"