parser3

#include <iostream>
#include <sstream>
#include <string>

using namespace std;

static bool stop = false;
int prior(char znak) {
	if ((znak == '-') || (znak == '+')) return 1;
	else if ((znak == '*') || (znak == '/')) return 2;
	else {
		stop = true;
		cout << "Error";
		exit(0);
		return 0;
	}
}
int count(int a, char znak, int b) {
	int res = 0;
	if (znak == '*') res = a*b;
	else if (znak == '-')res = a - b;
	else if (znak == '+') res = a + b;
	else if (znak == '/') {
		if (b == 0) cout << "Error";
		else res = a / b;
	}
	else {
		stop = true;
		cout << "Error";
		exit(0);
		return 0;
	}
	return res;
}

int main()
{
	string string;
	int begin, middle, last, itog = 0;
	char znak, znak2;
	getline(cin, string);
	istringstream stream(string);
	stream >> begin;
	stream >> znak;
	if (!(stream >> middle)) { cout << begin << endl; exit(0); }
	while (stream >> znak2) {
		bool lastprior = false;
		stream >> last;
		int prior1 = prior(znak), prior2 = prior(znak2);
		if ((prior1 > prior2) || (prior1 == prior2)) {
			begin = count(begin, znak, middle);
			itog = begin;
			middle = last;
			znak = znak2;
		}
		else if (prior2 > prior1) {
			middle = count(middle, znak2, last);
			itog = middle;
			lastprior = true;
		}
		else { stop = true; cout << "Error"; break; }
		if (!lastprior) itog = count(begin, znak, middle);
		else itog = count(begin, znak, middle);
	}
	if (!(stream >> znak2)) { cout << count(begin, znak, middle) << endl; stop = false; return 0; }
	if (!stop) cout << itog << endl;
}