S = input()
N = len(S)

numset = set(list('0123456789'))
num = ''
ls = []
for i in range(N):
    if S[i] in numset:
        num += S[i]
    else:
        ls.append(int(num))
        ls.append(S[i])
        num = ''
ls.append(int(num))
ans = ls[0]
for i in range(1,len(ls)-1):
    if ls[i] == '*':
        ans += ls[i+1]
    elif ls[i] == '+':
        ans *= ls[i+1]
print(ans)