# This finds the largest number in a
# list entered by the user.

# The point of this is to illustrate the
# technique of writing a main( ) function and
# calling it at the end.

def main():
    done = False
    big = 0
    while not done:
        num = eval(input( "Number? " ))
        if num <= 0:
            done = True
        elif num > big:
            big = num
    print( "The biggest number was %d" %big )

main()