import sys

is_on = False
sum = 0

def main():
    global sum,is_on
    for line in sys.stdin:
        line = line.strip()
        if line.isdigit() & is_on:
            sum += int(line)
        elif line.lower() == "on":
            is_on = True
        elif line.lower() == "off":
            is_on = False
        elif line == "=":
            print(sum)

if __name__ == "__main__":
    main()