#include <iostream>
#include <iomanip> // For std::setprecision
#include <cmath>   // For std::M_PI
 
int main() {
    // --- Step A: Ask the user for the diameter of the pizza ---
    double diameter;
    std::cout << "Enter the diameter of the pizza in inches: ";
    std::cin >> diameter;
 
    // --- Constants and Intermediate Calculations ---
    const double AREA_PER_SLICE = 14.125; // Area for each slice in square inches [1]
    const double PI = M_PI;              // Use the more precise value of PI from cmath [2]
    double radius = diameter / 2.0;      // Calculate the radius from the diameter [2]
    double pizzaArea = PI * radius * radius; // Calculate the total pizza area [2]
 
    // --- Step B: Calculate the number of slices ---
    // Divide the total pizza area by the area of one slice [1]
    double numberOfSlices = pizzaArea / AREA_PER_SLICE;
 
    // --- Step C: Display the number of slices ---
    // Use static_cast to convert to an integer (whole number of slices) [2]
    // Use std::fixed and std::setprecision to control output format [2]
    std::cout << "The " << diameter << "-inch pizza can be cut into "
              << static_cast<int>(numberOfSlices) << " slices." << std::endl;
 
    return 0;
}
 

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