import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

xopy = readline().rstrip().decode()
x = 1
xx = ''
flag = False
if xopy[0] == '-':
    x *= -1
    xopy = xopy[1:]
yy = ''
for xy in xopy:
    if flag:
        yy += xy
    else:
        if xy == '+':
            y = -1
            flag = True
        elif xy == '-':
            y = 1
            flag = True
        else:
            xx += xy
print(x * int(xx) + y * int(yy))