from operator import add, mul
S = input()
AB = [-1, -1]
i = 0
op = None
for c in S:
    if c in ('*', '+'):
        if AB[1] != -1:
            AB[0], AB[1] = op(*AB), -1
        op = add if c == '*' else mul
        i = 1
    else:
        AB[i] = (0 if AB[i]==-1 else AB[i] * 10) + int(c)
AB[0] = op(*AB)
print(AB[0])