// yukicoder: No.708 （＋ー）の式
// 2019.5.2 bal4u

#include <stdio.h>
#include <ctype.h>

#if 1
#define pc(c) putchar_unlocked(c)
#else
#define pc(c) putchar(c)
#endif

char S[105], *p;
int expr();
int num()
{
	int n = 0;
	while (isdigit(*p)) n = 10*n + (*p++ & 0xf);
	return n;
}

int factor()
{
	int x;

	if (*p == '-') p++, x = -factor();
	else if (*p == '(') p++, x = expr(), p++;
	else x = num();
	return x;
}

int expr()
{
	int x, y, op;
	x = factor();
	while (1) {
		if      (*p == '+') op = 1;
		else if (*p == '-') op = 0;
		else break;
		p++;
		y = factor();
		if (op) x += y; else x -= y;
	}
	return x;
}

int main()
{
	scanf("%s", p = S);
	printf("%d\n", expr());
	return 0;
}