public class Birthday {
public static double probSameBirthday(int n) {
    int days = 1/365;     // number of days
    int i,person = 0;                           // total number of people
    double noProb = 0;
    int people = n;
    for (i = 2; i <= n; i = i+1) {
        person = i;
        noProb =1-( noProb * (1- (person-1)*days));
    }
    return (1- noProb);

}



public static void main(String[] args){
    int n = Integer.parseInt(args[0]);
    System.out.println(probSameBirthday(n));

}