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#!/usr/bin/env ruby
def valof(reg_file, reg_or_int)
if reg_or_int >= 'a' && reg_or_int <= 'z' then
return reg_file[reg_or_int] || 0
end
return reg_or_int.to_i
end
input = $stdin.readlines.map(&:chomp)
reg = {}
pc = 0
muls = 0
loop do
break if pc < 0 || pc >= input.length
istr = input[pc].split
case istr[0]
when 'set'
reg[istr[1]] = valof(reg, istr[2])
when 'sub'
reg[istr[1]] = valof(reg, istr[1]) - valof(reg, istr[2])
when 'mul'
reg[istr[1]] = valof(reg, istr[1]) * valof(reg, istr[2])
muls += 1
when 'jnz'
if valof(reg, istr[1]) != 0 then
pc += valof(reg, istr[2])
pc -= 1
end
end
pc += 1
end
puts muls
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