from lib import *

data = open(0).read().strip()
part_2 = True

REGS = "abcd"

regs = {c: 0 for c in REGS}

if part_2:
    regs["c"] = 1

insts = data.splitlines()

i = 0
while i < len(insts):
    parts = insts[i].split()

    cmd = parts[0]
    if cmd == "cpy":
        if parts[1] in "abcd":
            regs[parts[2]] = regs[parts[1]]
        else:
            regs[parts[2]] = int(parts[1])
    elif cmd == "jnz":
        val = 0
        if parts[1] in "abcd":
            val = regs[parts[1]]
        else:
            val = int(parts[1])
        if val != 0:
            i += int(parts[2])
            continue
    elif cmd == "inc":
        regs[parts[1]] += 1
    elif cmd == "dec":
        regs[parts[1]] -= 1
    else:
        assert False
    i += 1


print(regs["a"])