cpp3

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

int main() {
    int x;
    cin >> x;
    double c = cos(x);
    cout << fixed << setprecision(10) << c << endl;
    int s = 2;
    int chisl = 1;
    int znam = 1;
    double ans = 1;
    int f = -1;
    while (c != ans) {
        znam *= (s - 1) * s;
        chisl *= x * x;
        ans += f * (chisl / znam);
        f *= f;
        s += 2;
    }
    cout << setprecision(10) << ans;
    return 0;
}