import re

S = input()

op = re.split('\d+', S)
ope = re.split('[+*]', S)

ans = int(ope[0])
j = 1
for i in range(len(op)):
    if op[i] == '*':
        ans += int(ope[j])
        j += 1
    elif op[i] == '+':
        ans *= int(ope[j])
        j += 1

print(ans)