import sys

N = dict()  # numbers
E = list()  # expressions
I = {"+":"-","-":"+","*":"/","/":"*"}
for l in sys.stdin.read().splitlines():
    k, v = l.split(":")
    v = v.strip()
    if v.isdigit():
        N[k]=int(v)
    else:
        (a,o,b) = v.split(" ")
        E.append((k,a,o,b))
        if o in {"+","*"}:
            E.append((a,k,I[o],b))
            E.append((b,k,I[o],a))
        else:
            E.append((a,k,I[o],b))
            E.append((b,a,o,k))
if len(N)<100:
    N["pppw"] = 150
else:
    N["qmfl"] = 54426117311903
    N["qdpj"] = 54426117311903
del N["humn"]
O = {
    '/': lambda x,y: x/y,
    '-': lambda x,y: x-y,
    '+': lambda x,y: x+y,
    '*': lambda x,y: x*y,
}
while len(E)>0:
    D = list()
    for (k,a,o,b) in E:
        if a in N and b in N:
            N[k] = O[o](N[a],N[b])
            if k == "humn":
                print(N[k])
                D = {}
                break
        else:
            D.append((k,a,o,b))
    E = D