#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define LENMAX 100000

char expr[LENMAX];
int len, i;
char oper[LENMAX], nr[LENMAX];
int lenOper, lenNr;

static inline int factor(){
    int retval = 0;

    while(isdigit(expr[i]))
        retval = retval * 10 + expr[i++] - '0';

    return retval;
};
static inline void pushNr(int number){
    nr[lenNr++] = number;
};
static inline int popNr(){
    return lenNr ? nr[--lenNr] : 0;
};
static inline void pushOper(char operatie){
    if (operatie == '*' || operatie == '/' || operatie == '+' || operatie == '-' || operatie == '(' || operatie == ')')
        oper[lenOper++] = operatie;
};
static inline char topOper(){
    return lenOper ? oper[lenOper - 1] : '\0';
};
static inline char popOper(){
    return lenOper ? oper[--lenOper] : '\0';
};
static inline int prio(char operatie){
    int retval = 0;

    if(operatie == '*' || operatie == '/')
        retval = 2;
    else if(operatie == '+' || operatie == '-')
        retval = 1;
    
    return retval;
};
static inline int comp(int a, int b, char operatie){
    int retval = 0;

    switch(operatie) {
    case '*':
        retval = a * b;
        break;
    case '/':
        retval = a / b;
        break;
    case '+':
        retval = a + b;
        break;
    case '-':
        retval = a - b;
        break;
    }
    /*if(operatie == '\0') 
        printf("estiprost");
    fputc(operatie, stdout);
    fputc('\n', stdout);*/
    return retval;
};
static inline void compTop(){
    int a, b;

    b = popNr();
    a = popNr();
    pushNr(comp(a, b, popOper()));
};
int main() {
    FILE *fin, *fout;

    fin = fopen("evaluare.in", "r");
    fgets(expr, LENMAX, fin);
    len = strlen(expr);
    fclose(fin);

    lenNr = lenOper = i = 0;

    while(i < len) {
        if(expr[i] >= '0' && expr[i] <= '9')
            pushNr(factor());
        else if(expr[i] == '(')
            pushOper(expr[i++]);
        else if(expr[i] == ')') {
            while(topOper() != '(')
                compTop();
            popOper();
            i++;
        } else if(prio(expr[i])) {
            while(prio(topOper()) && prio(topOper()) >= prio(expr[i]))
                compTop();
            pushOper(expr[i++]);
        } else
            i++;
        //printf("1");
    }

    while(lenOper)
        compTop();

    fout = fopen("evaluare.out", "w");
    fprintf(fout, "%d", popNr());
    fclose(fout);

    return 0;
}