s = input()

n = len(s)
a, b = '', ''
op = ''
for i in range(n):
    if i > 0:
        if not s[i].isdigit():
            if op == '':
                op = s[i]
            else:
                b += s[i]
        else:
            if op == '':
                a += s[i]
            else:
                b += s[i]
    else:
        a += s[i]
if op == '+':
    print(int(a) - int(b))
else:
    print(int(a) + int(b))