import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    A=I()
    p=1
    cnt=0
    while True:
        if p>=A:
            break
        else:
            p*=2
            cnt+=1
        
    ans=2*cnt
    
    p3=1
    cnt3=0
    while True:
        if p3>=A:
            break
        else:
            p3*=3
            cnt3+=1
            
    ans3=3*cnt3

    print(min(ans,ans3))            
    


main()