public class Main {

    public static void main(String[] args) {

     Scanner input = new Scanner(System.in);

     double n,k,i,j,f;
     k = input.nextDouble();
     n = 1; f = 0;
     for(i = 1;n <= i; i++) {
         j = (double)1/n;
         f = (double)(f + j);
     if(f>k) {
         System.out.println(n);
         break;
     } else {n++;}

     }
    }

}
结果没问题但全是wa