S = input()
x = []
l = 0
r = 0
while r < len(S):
    if S[r] in ["+", "*"]:
        x.append(S[l:r])
        x.append(S[r])
        l = r+1
        r = l
    r += 1
x.append(S[l:])
ans = int(x[0])
for i in range(2, len(x), 2):
    if x[i-1] == "+":
        ans *= int(x[i])
    else:
        ans += int(x[i])
print(ans)