import sys from string import digits def input(): return sys.stdin.readline().strip() def list2d(a, b, c): return [[c] * b for i in range(a)] def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)] def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)] def ceil(x, y=1): return int(-(-x // y)) def INT(): return int(input()) def MAP(): return map(int, input().split()) def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)] def Yes(): print('Yes') def No(): print('No') def YES(): print('YES') def NO(): print('NO') sys.setrecursionlimit(10 ** 9) INF = 10 ** 19 MOD = 10 ** 9 + 7 EPS = 10 ** -10 S = list(input()) N = len(S) for i in range(N-2): if S[i] not in digits and S[i+1] not in digits and S[i+2] in digits: if S[i] == '+': S[i] = '-' else: S[i] = '+' if S[i] in digits and S[i+1] not in digits and S[i+2] in digits: if S[i+1] == '+': S[i+1] = '-' else: S[i+1] = '+' ans = eval(''.join(S)) print(ans)