include <bits/stdc++.h>

using namespace std; string s; stack c; stack sc;

int level(char i) {

if (i == '^')
	return 3;
else if (i == '*' || i == '/')
	return 2;
else if (i == '+' || i == '-')
	return 1;
else
	return 0;

}

void calc() {

int a = c.top();
c.pop();
int b = c.top();
c.pop();
char ch = sc.top();
sc.pop();

if (ch == '+')
	c.push(b + a);
else if (ch == '-')
	c.push(b - a);
else if (ch == '*')
	c.push(b * a);
else if (ch == '/')
	c.push(b / a);
else if (ch == '^')
	c.push(pow(b, a));

}

int main() {

cin >> s;
s = '(' + s + ')';
int n = s.size();

for (int i = 0; i < n; i++) {

	if (s[i] >= '0' && s[i] <= '9') {
		int x = 0;

		while (s[i] >= '0' && s[i] <= '9') {
			x = x * 10 + s[i++] - '0';
		}

		c.push(x);
	}

	if (s[i] == '(')
		sc.push('(');
	else if (s[i] == ')') {
		while (sc.top() != '(')
			calc();
		sc.pop();
	} else {
		while (!sc.empty() && level(sc.top()) >= level(s[i]))
			calc();
		sc.push(s[i]);
	}
}

cout << c.top() ;
return 0;

}