// yukicoder: No.193 筒の数式
// 2019.4.13 bal4u

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

//// 高速入力
#if 1
#define gc() getchar_unlocked()
#define pc(c) putchar_unlocked(c)
#else
#define gc() getchar()
#define pc(c) putchar(c)
#endif
int ins(char *s)  // 文字列の入力　スペース以下の文字で入力終了
{
	char *p = s;
	do *s = gc();
	while (*s++ > ' ');
	*--s = 0;
	return s - p;
}

char S[30];

char *num(int *k, char *s)
{
	int n = 0;
	while (isdigit(*s)) n = 10 * n + (*s++ & 0xf);
	*k = n;
	return s;
}

int parse(char *s)
{
	int a, op, ans;
	
	s = num(&ans, s);
	while (*s) {
		op = *s++;
		s = num(&a, s);
		if (op == '+') ans += a;
		else ans -= a;
	}
	return ans;
}

int main()
{
	int i, c, w, a, ans;

	w = ins(S);
	memcpy(S + w, S, w);
	ans = -0x7fffffff;
	for (i = 0; i < w; i++) {
		if (isdigit(S[i]) && isdigit(S[i + w - 1])) {
			c = S[i + w], S[i + w] = 0;
			if ((a = parse(S + i)) > ans) ans = a;
			S[i + w] = c;
		}
	}
	printf("%d\n", ans);
	return 0;
}