#import sys
#sys.set_int_max_str_digits(1000001)
S=input()
while True:
    change=False
    X=len(S)
    for i in range(X):
        #print(9)
        if S[i]=='3':
            change=True
            T=S[:i]
            T+='2'
            for j in range(len(S)-i-1):
                T+='9'
            S=T
            break

    #print(S)
    #print(change)
    N=int(S)
    if N%3==0:
        change=True
        N-=1
    S=str(N)
    if change==False:
        print(N)
        break