# LINK: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem&problem=979
count=0
while True:
try:
s=input()
result=s.split('=')
if result[0].find('+')>0:
a,b=result[0].split('+')
a=int(a)
b=int(b)
if result[1]!='?' and a+b==int(result[1]):
count+=1
else:
a,b=result[0].split('-')
a=int(a)
b=int(b)
if result[1]!='?' and a-b==int(result[1]):
count+=1
except EOFError:
print(count)
break
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