s = list(input())
d = [0] * 100
p = [''] * 100

i = 0
j = 0
for ss in s:
    if ss >= '0' and ss <= '9':
        d[i] *= 10
        d[i] += int(ss)
    else:
        if ss == '*':
            p[j] = '+'
        else:
            p[j] = '*'
        i += 1
        j += 1
ans = d[0]
d.pop(0)
for k in range(i):
    if p[k] == '*':
        ans *= d[k]
    else:
        ans += d[k]
print(ans)