Individual Homework

#include <iostream>
#include <fstream>
#include <cmath>
#define M_PI 3,1415926535
using namespace std;

int main()
{
    long double angle = 0;
    int i = 1, n, x = 0, y = 0;
    ifstream input;
    input.open("INPUT.txt");
    input >> n;
    input.close();
    ofstream output;
    output.open("OUTPUT.txt");
    if (n>0 && n<=300) {
      output << "YES" << endl;
      while (i <= n) {
        x = cos(angle) * 10000;
        y = sin(angle) * 10000;
        output << x << ' ' << y << endl;
        angle += (2 *M_PI) / (n+1);
        ++i;
      }
    }
    else output << "NO" << endl;
    output.close();
    return 0;
}