多项式相加

p = input().split(',')
p1 = [i.split(' ') for i in p]
for i in p1:
    if '' in i:
        i.remove('')

# print(p1)
g = input().split(',')
g1 = [i.split(' ') for i in g]
for i in g1:
    if '' in i:
        i.remove('')

# print(g1)
f = p1 + g1
# print(f)
x = input()
count = 0
for i in f:
    if i[1] == x:
        count += int(i[0])
print(count)