s = input()

temp = ''
num = []
cal = []
for i in range(len(s)):
    if s[i] != '*' and s[i] != '+':
        temp += s[i]
    else:
        num.append(int(temp))
        temp = ''
        if s[i] != '*':
            cal.append(0)
        else:
            cal.append(1)
num.append(int(temp))

ans = num[0]
cnt = 1
for i in range(len(cal)):
    if cal[i] == 1:
        ans += num[cnt]
    else:
        ans *= num[cnt]
    cnt += 1
print(ans)