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#!/usr/bin/env python3
import sys
def decomplen(s):
total=0
i=0
while i<len(s):
if s[i]=="(":
closeidx=s.index(")",i+1)
marker=[int(x) for x in s[i+1:closeidx].split("x")]
repstr=s[closeidx+1:closeidx+1+marker[0]]
total+=marker[1]*decomplen(repstr)
i=closeidx+1+marker[0]
else:
total+=1
i+=1
return total
print(decomplen(sys.stdin.readline()[:-1]))
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