import re
def calculate(S):
    S = re.findall(r'\d+|\D', S)
    result = int(S[0])
    for i in range(1, len(S), 2):
        if S[i] == '+':
            result += int(S[i+1])
        elif S[i] == '*':
            result *= int(S[i+1])
    return result
S = input().translate(str.maketrans('+*', '*+'))
print(calculate(S))