S = input()
l1 = []
l2 = []
num = 0
for s in S:
    if s == "+" or s == "*":
        l1.append(num)
        num = 0
        l2.append(s)
    else:
        num *= 10
        num += int(s)
l1.append(num)
ans = l1[0]

for i in range(len(l2)):
    if l2[i] == "*":
        ans += l1[i+1]
    else:
        ans *= l1[i+1]
print(ans)