02. Product Sign

#include <iostream>

using namespace std;

int main() {
    int firstNumber, secondNumber, thirdNumber, negativeNumbers = 0;
    cin >> firstNumber >> secondNumber >> thirdNumber;

    if (firstNumber < 0) {
        negativeNumbers++;
    }
    if (secondNumber < 0) {
        negativeNumbers++;
    }
    if (thirdNumber < 0) {
        negativeNumbers++;
    }

    if (negativeNumbers % 2 == 0 || (firstNumber == 0 || secondNumber == 0 || thirdNumber == 0)) {
        cout << '+' << endl;
    }
    else {
        cout << '-' << endl;
    }

    return 0;
}