n = int(input())
# a>b>c
a = n // 100;
b = n // 10 % 10;
c = n % 10;
if a < b:
    t=a
    a=b
    b=t 
if a < c:
    t=a
    a=c
    c=t 
if b < c:
    t=b
    b=c
    c=t
if c != 0:
    print(c*100+b*10+a)
elif b == 0 and c == 0:
    print(a*100)
elif c == 0:
    print(b*100 + a)
/**************************************************************
	Problem: 1243
	User: admin
	Language: Python
	Result: Accepted
	Time:93 ms
	Memory:34480 kb
****************************************************************/