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

enum{ MAXN = (int)2e6 };

typedef struct list
{
    char type;
    long long key;
    struct list *next;
} list;

char s[MAXN];
list* brackets[MAXN];


long long getnum(int it)
{
    while ((s[it] != '\0') && (s[it] == '0'))
        ++it;

    if (s[it] < '0' || '9' < s[it])
        return 0;

    int curr = it;
    while ((s[curr] != '\0') && (('0' <= s[curr]) && (s[curr] <= '9')))
        ++curr;

    --curr;
    long long res = 0;
    int p = 0;
    while (it <= curr)
    {
        if (!p)
            p = 1;
        res += (s[curr] - '0') * p;
        --curr;
        p *= 10;
    }

    return res;
}

long long compute(list *tmp)
{
    int sum = 0;
    int current = 0;
    int sign = 1;

    tmp = tmp->next;

    if (tmp->type == '-')
        sign = -1, tmp = tmp->next;

    while (tmp->type != ')')
    {
        current = tmp->key;
        tmp = tmp->next;

        char operation = tmp->type;

        while ((operation == '*' || operation == '/') && (tmp->next->type != ')'))
        {
            if (operation == '*')
                current *= tmp->next->key;
            else
                current /= tmp->next->key;

            tmp = tmp->next->next;
            operation = tmp->type;
        }

        current *= sign;
        sum += current;
        char oper = tmp->type;

        if (oper == '-' || oper == '+')
        {
            tmp = tmp->next;

            if (oper == '-')
                sign = -1;
            else
                sign = 1;
        }
    }

    return sum;
}

int main(void)
{
    FILE* in = fopen("input.txt", "r");
    FILE* out = fopen("output.txt", "w");

    fgets(s, MAXN, in);

    int it = 0;
    list *buff = malloc(sizeof(list));
    buff->type = '(';
    list *stak = buff;


    while (s[it] != '\0')
    {
        if (('0' <= s[it]) && (s[it] <= '9'))
        {
            int curr = getnum(it);
            buff->next = malloc(sizeof(list));
            buff = buff->next;
            buff->type = 'i';
            buff->key = curr;

            while ((s[it] != '\0') && (('0' <= s[it]) && (s[it] <= '9')))
                ++it;
            --it;
        }
        else if (s[it] != ' ')
        {
            buff->next = malloc(sizeof(list));
            buff = buff->next;
            buff->type = s[it];
        }

        ++it;
    }

    buff->next = malloc(sizeof(list));
    buff = buff->next;
    buff->type = ')';
    buff->next = NULL;

    int currbr = 0;

    while (stak)
    {
        if (stak->type == '(')
        {
            brackets[currbr] = stak;
            ++currbr;
        }

        if (stak->type == ')')
        {
            --currbr;
            long long res = compute(brackets[currbr]);
            brackets[currbr]->type = 'i';
            brackets[currbr]->key = res;
            brackets[currbr]->next = stak->next;
        }

        stak = stak->next;
    }

    fprintf(out, "%d", brackets[currbr]->key);

    return 0;
}