#!/usr/bin/env python3
s = list(input())
p = 0


def term():
    global p
    n = 0
    while p < len(s) and s[p] != '*' and s[p] != '+':
        n = n * 10 + int(s[p])
        p += 1
    return n


def expr():
    global ans, p
    q = p
    p += 1
    t = term()
    if s[q] == '*':
        ans += t
    else:
        ans *= t


ans = term()
while p < len(s):
    expr()
print(ans)