#include<stdio.h>
int main()
{
	char s[1003];
	scanf("%s", s);
	int xx, x, yy, y, p;
	int i = 0;
	xx = 1;
	if (s[i] == '-')
	{
		xx = -1;
		i++;
	}
	else if (s[i] == '+')
		i++;
	x = 0;
	for (; '0' <= s[i] && s[i] <= '9'; i++)
		x = 10 * x + s[i] - '0';
	if (s[i] == '-')
		p = -1;
	else
		p = 1;
	i++;
	yy = 1;
	if (s[i] == '-')
	{
		yy = -1;
		i++;
	}
	else if (s[i] == '+')
		i++;
	y = 0;
	for (; s[i] != '\0'; i++)
		y = 10 * y + s[i] - '0';
	printf("%d\n", xx * x - p * yy * y);
	return 0;
}