S = input()
p = []
n = ''
for i, s in enumerate(S):
    if s.isdigit():
        n += s
        if i == len(S)-1:
            p.append(n)
    elif s == '*':
        p.append(n)
        p.append('+')
        n = ''
    else:
        p.append(n)
        p.append('*')
        n = ''
        
while True:
    a, b, c = p[:3]
    calc = str(eval(a+b+c))
    p = [calc] + p[3:]
    if len(p) == 1:
        print(p[0])
        break