def alice(S):
    for i in range(1, len(S)):
        if (S[i] == '+') or (S[i] == '-'):
            op = S[i]
            x = S[:i]
            y = S[i+1:]
            if x[0] == '-':
                x = int(x[1:]) * (-1)
            else:
                x = int(x)
            if y[0] == '-':
                y = int(y[1:]) * (-1)
            else:
                y = int(y)
            if op == '+':
                ans = x - y
                return ans
            elif op == '-':
                ans = x + y
                return ans

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

if __name__ == '__main__':
    main()