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#include <iostream>
#include <cmath>

int main() {
    // Declare variables
    double radius, area;

    // Prompt user for input
    std::cout << "Enter the radius of the circle: ";
    std::cin >> radius;

    // Calculate area using the formula A = π * r^2
    area = M_PI * std::pow(radius, 2);

    // Display the result
    std::cout << "The area of the circle with radius " << radius << " is: " << area << std::endl;

    // Exit program
    return 0;
}