from sys import stdin

def main():
    XY = input()

    x = XY[0]
    for i, s in enumerate(XY[1:], start=1):
        if s in ('+', '-'):
            x = int(XY[:i])
            y = int(XY[i+1:])
            if s == '+':
                ans = x - y
            else:
                ans = x + y
            break
    print(ans)

input = lambda: stdin.readline().rstrip()
main()