#!/usr/bin/env python3
import sys

def main():
    N = int(input())
    ans = 0
    while N > 1:
        if N % 2 == 1:
            N += 1
            ans += 1
        else:
            N //= 2
            ans += 1
    print(ans)
    return
   
        
if __name__ == '__main__':
    main()