#include <bits/stdc++.h>
using namespace std;
 
string trimLeft(string str) {
	if (!str.size()) return "";
	int i = 0;
	while (str[i] == ' ' || str[i] == '0') {
		i++;
	}
 
	return str.substr(i);
}
 
 
bool checkIsValidString(string str) {
	for (int i = 0; i < str.size(); i++) {
		if (!isdigit(str[i])) {
			return false;
		}
	}
 
	return true;
}
 
int myAtoi (string str) {
	if (!str.size()) return 0;
 
	bool hasNegativeSymbol = str[0] == '-';
	bool hasPositiveSymbol = str[0] == '+';
	string s = (hasNegativeSymbol || hasPositiveSymbol) ? str.substr(1) : str;
 
	s = trimLeft(s);
 
	bool isValidInput = checkIsValidString(s);
	if (!isValidInput) return 0;
 
	int size = s.size(), result = 0, currentPower = 0;
 
	for (int i = size - 1; i >= 0; i--) {
		int currentNumber = s[i] - '0';
		result = result + (currentNumber * pow(10, currentPower++));
	}
 
	return hasNegativeSymbol ? -result : result;
}
 
int main() {
	string s;
 
	while (cin >> s) {
		cout << myAtoi(s) << endl;
	}
 
	return 0;
}

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