#include <stdio.h>
int main(void){

  int N,i=0;
  int cookies=1;

  do{
    scanf("%d",&N);
  }while(N<1||N>100000000);

  if(N==1){
    printf("0\n");
  }
  else{
    while(1){
      cookies*=2;
      if(cookies<N){
        i++;
      }
      else{
        break;
      }
    }
    printf("%d\n",i+1);
  }



return 0;
}