def is_happy (n):
    cnt1 = n%10;
    n = n/10;
    cnt1 = cnt1 + n%10;
    n = n/10;
    cnt1 = cnt1 + n%10;
    n = n/10;
    cnt2 = n%10;
    n = n/10;
    cnt2 = cnt2 + n%10;
    n = n/10;
    cnt2 = cnt2 + n;
    if cnt1 == cnt2:
        return True
    else:
        return False
n = int(input())
i = 0;
while 1:
    if is_happy(n-i):
        print(n-i)
        exit(0)
    if is_happy(n+i):
        print(n+i)
        exit(0)
    i = i + 1;