import sys

X = 1
C = 0
S = []
I = {20, 60, 100, 140, 180, 220}

def inc():
  global C
  C += 1
  if C in I:
    S.append(C*X)
  
for l in sys.stdin.read().splitlines():
  m, q = (l+" _").split(" ")[:2]
  if m == "noop":
    inc()
  else: # add
    inc()
    inc()
    X += int(q)

print(sum(S))