#include <iostream>
#include <cmath>   // for sqrt() and M_PI
 
using namespace std;
 
int main() {
    double L, g, T;
 
    // Input values
    cout << "Enter the length of the pendulum (L in meters): ";
    cin >> L;
 
    cout << "Enter the acceleration due to gravity (g in m/s^2): ";
    cin >> g;
 
    // Formula: T = 2 * pi * sqrt(L / g)
    T = 2 * M_PI * sqrt(L / g);
 
    // Output result
    cout << "The time period of the simple pendulum is: " << T << " seconds" << endl;
 
    return 0;
}

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