import sys
sys.setrecursionlimit(10**7)
S = input()
N = len(S)

ans = []
def f(n,mod,giri):
    if(n == N):
        if(mod != 0):
            print(*ans,sep="")
            exit()
        else:
            return
    if(giri):
        for i in range(int(S[n]),-1,-1):
            if(i == 3):continue
            if(i == int(S[n])):
                ans.append(i)
                f(n+1,(mod+i)%3,True)
                ans.pop()
            else:
                ans.append(i)
                f(n+1,(mod+i)%3,False)
                ans.pop()
    else:
        for i in range(9,-1,-1):
            if(i == 3):continue
            ans.append(i)
            f(n+1,(mod+i)%3,False)
            ans.pop()

f(0,0,True)