N = list(input())

id = -1
for i in range(len(N)):
    if N[i] == "3" and id == -1:
        id = i
        break
#print(id)
if id == -1:
    d_sum = 0
    for i in range(len(N)):
        d_sum += int(N[i])
    if d_sum % 3 == 0:
        now = 1
        while N[-now] == "0":
            N[-now] = "9"
            now+=1
        N[-now] = str(int(N[-now])-1)
else:
    d_sum = 0
    for i in range(id):
        d_sum += int(N[i])
    d_sum += 2
    N[id] = "2"
    for j in range(id+1,len(N)):
        d_sum += 9
        N[j] = "9"
    if d_sum % 3 == 0:
        now = 1
        while N[-now] == "0":
            N[-now] = "9"
            now+=1
        N[-now] = str(int(N[-now])-1)
print("".join(N))