#include <iostream>
#include <cmath> 

using namespace std;

int main() {
    int x;
    cout << "Enter the value of x: ";
    cin >> x;

    switch (x) {
        case 6: {
            double a = 2;
            double b = 3;
            double result1 = a * x + b * x * x;
            cout << "For x = 6, ax + bx*x = " << result1 << endl;
            break;
        }
        case 2: {
            double e = exp(1); 
            double result2 = e + x * x;
            cout << "For x = 2, e + x*x = " << result2 << endl;
            break;
        }
        case 7: {
            double b = 1;
            double result3 = sin(2 * b * x);
            cout << "For x = 7, sin(2 * b * x) = " << result3 << endl;
            break;
        }
        default:
            cout << "No operation defined for this value of x." << endl;
    }

    return 0;
}