def keisan(S):
    S = list(S)
    cnvS = []
    m = 0
    s = ''
    for n in range(len(S)):
        if (S[n] == '*') or (S[n] == '+'):
            for i in range(m, n):
                s = s + S[i]
            cnvS.append(int(s))
            cnvS.append(S[n])
            s = ''
            m = n + 1
        elif n == len(S) - 1:
            for i in range(m, n + 1):
                s = s + S[i]
            cnvS.append(int(s))
    j = 0
    ans = cnvS[0]
    while j < len(cnvS) - 2:
        if cnvS[j + 1] == '*':
            ans += cnvS[j + 2]
        elif cnvS[j + 1] == '+':
            ans *= cnvS[j + 2]
        j += 2
    return ans


def main():
    S = input()
    print(keisan(S))

if __name__ == '__main__':
    main()