public class ABC {
   public int a(int value) {
       int sm = 0;
       for (int i=0; i<value; i++) {
           sm += i;
       }
       return b(sm);
   } 
   public int b(int valB) {
       int j= valB/10;
       while (j>0) {
           valB -= j;
           j--;
       }
       return c(valB);
   }
   public int c(int valC) {
       int cc = 0;
       while (valC>0) {
           valC = valC/2;
           cc++;
       }
       return cc;
   }
   public static void main(String[] args) {
       int jj = (new ABC()).a(9);
       System.out.println(jj);
   }
}