#include<stdio.h>
int main()
{
	char s[102];
	scanf("%s", s);
	int i, ans = 0, k = 1, v = 1;
	for (i = 0; s[i] != '\0'; i++)
	{
		if (s[i] == '+')
			k = 1;
		else if (s[i] == '-')
			k = -1;
		else if (s[i] == ')')
			k = v = 1;
		else if (s[i] == '(')
		{
			v = k;
			k = 1;
		}
		else
		{
			if (s[i + 1] == '(')
				k *= s[i] - '0';
			else
				ans += v * k * (s[i] - '0');
		}
	}
	printf("%d\n", ans);
	return 0;
}