solution17.py

'''
Write a program that computes the net amount of a bank account based a transaction log from console input. The transaction log format is shown as following:

D 100
W 200
D means deposit while W means withdrawal.
Suppose the following input is supplied to the program:

D 300
D 300
W 200
D 100
Then, the output should be:

500
'''

# amount = 0
# while True:
#     log = input().split()
#     if not log:
#         break
#     if 'D' == log[0]:
#         amount += int(log[1])
#     elif 'W' == log[0]:
#         amount -= int(log[1])
#     else:
#         print("wrong log")
# print(amount)

total = 0
while True:
    s = input().split()
    if not s:            # break if the string is empty
        break
    # two inputs are distributed in cm and num in string data type
    cm, num = map(str, s)

    # if cm=='D':
    #     total+=int(num)
    # if cm=='W':
    #     total-=int(num)

print(total)