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Problems

# Interesting Sum

Given a three-digit positive integer n. Find the sum of the largest and the smallest three-digit numbers that can be formed from a permutation of n numbers.

#### Input

One integer n (100n999).

#### Output

Print the sum of the largest and the smallest three-digit number.

Time limit 1 second
Memory limit 128 MiB
Input example #1
524

Output example #1
787