#include <iostream>
#include <cassert>
using namespace std;
int find_value()
{
    int value=0, seek_char, temp, op;
    bool uminus=false;

    seek_char = getc(stdin);
    if(seek_char == '-') uminus = true, seek_char = getc(stdin);
    if(seek_char == '(') value = find_value();
    else ungetc(seek_char, stdin), scanf("%d", &value);
    if(uminus) uminus = false, value *= -1;

    while(1) {
        seek_char = getc(stdin);
        if(seek_char == -1 || seek_char == ')' || seek_char == '\n') break;

        op = seek_char;
        seek_char = getc(stdin);
        if(seek_char == '-') uminus = true, seek_char = getc(stdin);
        if(seek_char == '(') temp = find_value();
        else ungetc(seek_char, stdin), scanf("%d", &temp);
        if(uminus) uminus = false, temp *= -1;

        if(op == '+') value += temp;
        else if(op == '-') value -= temp;
        else assert(op == '*'), value *= temp;
    }

    return value;
}
int main()
{
    printf("%d", find_value());
    return 0;
}