def calc ():
    s = str(input())
    mass_oper = []
    for i in range(len(s)):
        if s[i] == "+":
            mass_oper.append("+")
            s = s.replace(s[i]," ")
        if s[i] == "-":
            mass_oper.append("-")
            s = s.replace(s[i]," ")
        if s[i] == "*":
            mass_oper.append("*")
            s = s.replace(s[i]," ")
    mass = s.split()
    for p in range(len(mass)):
        mass[p] = int(mass[p])
    for k in range (len(mass_oper)):
        if (mass_oper[k] == "*"):
            mass[k] = mass[k] * mass[k + 1]
            mass.pop((k + 1))
            mass_oper.pop(k)
    for r in range(len(mass_oper)):
        if(mass_oper[r]=="-"):
            mass[r] = mass[r] - mass[r+1]
        if(mass_oper[r]=="+"):
            mass[r] = mass[r] + mass[r+1]
    return(mass[0])

print(calc ())