#include <iostream>

using namespace std;

void addition(int a, int b) {
    cout << a + b << endl;
}
void subtraction(int a, int b) {
    cout << a - b << endl;
}
void multiplication(int a, int b) {
    cout << a * b << endl;
}
void division(int a, int b) {
    if (b != 0) {
        cout << (double)a / b << endl;
    }
    else {
        cout << "Can't divide by zero." << endl;
    }
}

int main() {
    double n1, n2;
    cin >> n1 >> n2;

    char operation;
    cin >> operation;

    if (operation == '+') {
        addition(n1, n2);
    }
    else if (operation == '-') {
        subtraction(n1, n2);
    }
    else if(operation == '*') {
        multiplication(n1, n2);
    }
    else {
        division(n1, n2);
    }

    return 0;
}