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#!/usr/bin/env python3
import sys, re
ins=[({"R":-1j,"L":1j}[s[0]],int(s[1:])) for s in re.findall(r"[RL]\d+",sys.stdin.readline())]
hits={}
p=0
d=1
for i in ins:
d*=i[0]
for _ in range(i[1]):
p+=d
hits[p]=hits.get(p,0)+1
if hits[p]>=2:
print(int(abs(p.real)+abs(p.imag)))
sys.exit(0)
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