S = input()
memo = []
tmp = []

for s in S:
    if s == '*' or s == '+':
        # 精算
        memo.append(int(''.join(tmp)))
        tmp = []
        memo.append(s)
    
    else:
        tmp.append(s)
else:
    memo.append(int(''.join(tmp)))

M = len(memo)
ans = memo[0]
for i in range(1, M, 2):
    ope = memo[i]
    num = memo[i + 1]
    if ope == '*':
        ans += num
    else:
        ans *= num

print(ans)