import sys
input = sys.stdin.readline

LIST=[[[0,1,2,4,5,6],[3,4,5,6]],
      [[2,5],[1,4]],
      [[0,2,3,4,6]],
      [[0,2,3,5,6]],
      [[1,2,3,5]],
      [[0,1,3,5,6]],
      [[0,1,3,4,5,6],[1,3,4,5,6]],
      [[0,2,5],[0,1,2,5]],
      [[]],
      [[0,1,2,3,5,6],[0,1,2,3,5]]
      ]

def calc(S):
    NOW=[[0]*7]
    NNOW=[]

    for i in range(len(S)):
        s=S[i]
        now2=[]

        while NOW:
            nowl=NOW.pop()    
                
            for ll in LIST[int(s)]:
                ni=nowl[:]
                for x in ll:
                    ni[x]+=1
                now2.append(ni[:])

        #print(now2)

        now2.sort()
        NOW=[]
        for x in now2:
            if NOW and NOW[-1]==x:
                continue
            if max(x)-min(x)>N//2+1:
                continue
            NOW.append(x)

        #print(s,NOW)

        if NOW==[]:
            return len(S)-i

    for x in NOW:
        if len(set(x))==1:
            return -1
    return 0

N=int(input())
while True:
    #print(N)
    ANS=calc(str(N))

    if ANS==-1:
        print(N)
        break
    else:
        N+=10**ANS