#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define MAXVAL 1000
#define Number '0'
int sp = 0;
int i = 0;
int last = 0;
int k = 0;
char val[MAXVAL];
char array[MAXVAL];

char pop(void) {
	if (sp > 0) {
		sp--;
		return val[sp];
	}
	else {
		return -1;
	}
}

void push(char f) {
	last = (f == '(') ? 0 : last;
	if (f == '*' || f == '/') {
		if (last == 2) {
			array[k] = pop();
			k++;
			array[k] = ' ';
			k++;
		}
		last = 2;
	}
	if (f == '+' || f == '-') {
		if (last != 0) {
			array[k] = pop();
			k++;
			array[k] = ' ';
			k++;
		}
		last = 1;
	}
	if (sp < MAXVAL) {
		val[sp] = f;
		sp++;
	}
	else {
		printf("стек переполнен");
	}
}

char type(char b) {
	return ((int)b >= 48 && (int)b <= 57) ? Number : b;
}

int main(void) {
	int j,count=0;
	int fin[MAXVAL];
	char in[2*MAXVAL];
	gets(in);
	long int N = strlen(in);
	if (N == 0) {
		printf("syntax error");
		return 0;
	}
	for (i = 0;i < N;i++) {
		if (type(in[i]) != Number && type(in[i - 1]) == Number && i>0) {
			array[k] = ' ';
			k++;
		}
		if ((type(in[N - 1]) != Number && in[N - 1]!='(' && in[N - 1]!=')') || (type(in[N-1])!=Number && type(in[N-2])!=Number && in[N-2]!=')')|| in[N - 1] == '(') {
			printf("syntax error");
			return 0;
		}
		if ((type(in[i]) != Number && in[i] != '(' && in[i] != ')') && (type(in[i - 1]) != Number && in[i-1] != '(' && in[i-1] != ')') && i > 0) {
			printf("syntax error");
			return 0;
		}
		switch (type(in[i]))
		{
		case Number:
			array[k] = in[i];
			k++;
			break;
		case '(':
			push(in[i]);
			count++;
			break;
		case '*':
			push(in[i]);
			break;
		case '/':
			push(in[i]);
			break;
		case '-':
			push(in[i]);
			break;
		case '+':
			push(in[i]);
			break;
		case ')':
			count--;
			if (in[i - 1] == '(') {
				printf("syntax error");
				return 0;
			}
			while (1) {
				array[k] = pop();
				if (array[k] == '(') {
					push(pop());
					break;
				}
				k++;
				array[k] = ' ';
				k++;
			}
			break;
		default:
			printf("syntax error");
			return 0;
			break;
		}
	}
	if (count !=0) {
		printf("syntax error");
		return 0;
	}
	int counter = 0;
	for (j = 0;j < k;j++) {
		in[j] = array[j];
		counter++;
	}
	for (j = sp - 1;j >= 0;j--) {
		in[counter] = ' ';
		counter++;
		in[counter] = val[j];
		counter++;
	}
	int counter1 = 0;
	long int summ = 0;
	for (i = 0;i < counter;i++) {
		//printf("%c", in[i]);
		if (type(in[i]) == Number) {
			summ = (summ * 10) + (int)in[i] % 48;
			continue;
		}
		else {
			if (in[i] == ' ' && type(in[i - 1]) == Number) {
				fin[counter1] = summ;
				summ = 0;
				counter1++;
				continue;
			}
		}
		switch (type(in[i]))
		{
		case '+':
			fin[counter1 - 2] = fin[counter1 - 1] + fin[counter1 - 2];
			counter1 = counter1 - 1;
			break;
		case '-':
			fin[counter1 - 2] = fin[counter1 - 2] - fin[counter1 - 1];
			counter1 = counter1 - 1;
			break;
		case '*':
			fin[counter1 - 2] = fin[counter1 - 1] * fin[counter1 - 2];
			counter1 = counter1 - 1;
			break;
		case '/':
			if (fin[counter1 - 1] == 0) {
				printf("division by zero");
				return 0;
			}
			fin[counter1 - 2] = fin[counter1 - 2] / fin[counter1 - 1];
			counter1 = counter1 - 1;
			break;
		}
	}
	if (fin[0] ==-858993460) {
		fin[0] = summ;
	}
	printf("%d", fin[0]);
	getchar();
	getchar();
	return 0;
}