Problem:
Score : 100 points

Problem Statement

Iroha loves Haiku. Haiku is a short form of Japanese poetry. A Haiku consists of three phrases with 5, 7 and 5 syllables, in this order.

To create a Haiku, Iroha has come up with three different phrases. These phrases have A, B and C syllables, respectively. Determine whether she can construct a Haiku by using each of the phrases once, in some order.

Constraints

1≦A,B,C≦10

Input

The input is given from Standard Input in the following format:

A B C

Output

If it is possible to construct a Haiku by using each of the phrases once, print YES (case-sensitive). Otherwise, print NO.

Sample Input 1

5 5 7

Sample Output 1

YES

Using three phrases of length 5, 5 and 7, it is possible to construct a Haiku.

Sample Input 2

7 7 5

Sample Output 2

NO

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Happy {
    class Program {
        static void exc (ref int a, ref int b) {
            int t = a;
            a = b;
            b = t;
        }
        static void Main (string[] args) {
            string[] uinp;
            uinp = Console.ReadLine ().Split (new char[] { ' ' });
            int a, b, c;
            int.TryParse (uinp[0], out a);
            int.TryParse (uinp[1], out b);
            int.TryParse (uinp[2], out c);
            if (a > b) exc (ref a, ref b);
            if (b > c) exc (ref b, ref c);
            if (a > b) exc (ref a, ref b);
            if ((a == 5) && (b == 7) && (c == 7)) Console.WriteLine ("YES");
            else Console.WriteLine ("NO");
        }
    }
}