S = input() + '*'

ans = 0
v = 0
m = '*'
for i in range(len(S)):
    if S[i] in ['*', '+']:
        if m == '*':
            ans += v
        else:
            ans *= v
        m = S[i]
        v = 0
        continue
    v = v*10 + int(S[i])    
print(ans)