S = input()
opes = []
nums = []
n = 0

for i in range(len(S)):
    if S[i] in ['*', '+']:
        nums.append(n)
        n = 0
        opes.append(S[i])
    else:
        n = 10*n+int(S[i])

nums.append(n)
ans = nums[0]

for o, n in zip(opes, nums[1:]):
    if o=='*':
        ans += n
    elif o=='+':
        ans *= n

print(ans)