import sys
input = sys.stdin.readline

# For taking space seperated integer variable inputs.
def insep():
    return(map(int,input().split()))

def main():
    a = 3
    b = 8

    operations = 0

    while (a != b):
        if a < b:
            a += 1
            operations += 1
        else:
            if a % 2 == 0:
                a = a / 2
                operations += 1
            else:
                a += 1
                operations += 1

    print(operations)


main()