#!/usr/bin/env python3
s = list(input())
ans = 0
l, r = 0, 0
x, y = 0, 0
while l < len(s):
    while l < len(s) and s[l] != '*' and s[l] != '+':
        x *= 10
        x += int(s[l])
        l += 1
    r = l + 1
    while r < len(s) and s[r] != '*' and s[r] != '+':
        y *= 10
        y += int(s[r])
        r += 1

    if s[l] == '*':
        ans = x + y
    else:
        ans = x * y
    x = ans
    y = 0
    l = r

print(ans)