#include <stdio.h>
int main(void){
    long N, i = 0, X = 1;
    scanf("%d", &N);
    while(N != 1){
        if(N % 2 == 1){
            N++;
            N /= 2;
            i += 2;
        }
        else if(N % 2 == 0){
            N /= 2;
            i++;
        }
    }
    printf("%d\n", i);
    return 0;
}