#include <iostream>
using namespace std;
int main(int argc, const char * argv[]) {
    float num_1, num_2, result;
    char b;
    while (true) {
        cin >> num_1;
        cin >> b;
        cin >> num_2;
        if (((num_1 <= 0 || num_1 >= 0) && (num_2 <= 0 || num_2 >= 0) && (b == '+' || b == '*' || b == '%' || b == '-' || b == '/'))) {
        }
        else {
            cout << "You specified an incorrect action!" << endl;
        }
        if (b == '/' && num_2 == 0) {
            cout << "Error, can not divide by zero!" << endl;

        }
        else if(b == '%' && num_2 == 0) {
            cout << "Error, can not divide by zero!" << endl;
        }
        else {
            if (b == '/') {
                result = num_1 / num_2;
                cout << num_1 << "/" << num_2 << "=" << result << endl;
                return 0;
                }
            if (b == '+') {
                result = num_1 + num_2;
                cout << num_1 << "+" << num_2 << "=" << result << endl;
                return 0;
            }
            if (b == '*') {
                result = num_1 * num_2;
                cout << num_1 << "*" << num_2 << "=" << result << endl;
                return 0;
            }
            if (b == '-') {
                result = num_1 - num_2;
                cout << num_1 << "-" << num_2 << "=" << result << endl;
                return 0;
            }
        }
    }
}