# -*- coding:utf-8 -*-

if __name__ == "__main__":
	S = raw_input()

	for i,s in enumerate(S[1:]):
		if s.isdigit():
			continue
		else:
			ope = s
			ope_num = i + 1
			break
	num1 = int(S[:ope_num])
	num2 = int(S[ope_num+1:])
	if ope == "-":
		print num1 + num2
	else:
		print num1 - num2