i = 0
sum_all = 0
read1 = ""
inp_min=-20000000
inp_max=20000000
max_count = 40

# print "It counts SUM of inputed up to %s integer values from range [%s,%s]. Please use 'Enter' to exit." %(max_count, inp_min, inp_max)

while i < max_count:
#    read1 = raw_input("Please enter new value: ")
    read1 = raw_input()
    if len(read1) == 0:
#        print "Exit. '%s' were inputed. The Sum is : '%s' "%(i, sum)
        break
    int1 = int(read1)
    if int1 >= inp_min and int1 <= inp_max:
        sum_all = sum_all + int1
        i = i+1
#    else:
#        print "Entered value '%s' is out in the range of [%s,%s]. Please try again or press 'Enter' to exit" %(int1, inp_min, inp_max)

print sum_all