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#!/usr/bin/env ruby
input = $stdin.readlines.map(&:chomp)
h = {}
max = 0
input.each do |line|
cmd, cond = line.split(' if ')
cmda = cmd.split
reg = cmda[0]
h[reg] = 0 if h[reg].nil?
chg = (cmda[1] == 'inc' ? cmda[2].to_i : -cmda[2].to_i)
conda = cond.split
h[conda[0]] = 0 if h[conda[0]].nil?
go = case conda[1]
when '<'
h[conda[0]] < conda[2].to_i
when '<='
h[conda[0]] <= conda[2].to_i
when '=='
h[conda[0]] == conda[2].to_i
when '>='
h[conda[0]] >= conda[2].to_i
when '>'
h[conda[0]] > conda[2].to_i
when '!='
h[conda[0]] != conda[2].to_i
end
h[reg] += chg if go
nmax = h.to_a.map(&:last).max
max = nmax if nmax > max
end
puts max
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