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 static System.Console;

namespace prg_AtCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] input = ReadLine().Split(' ');
            int count = 0;
            bool Flag = false;

            for(int i = 0; i < 3; ++i)
            {
                if(input[i] == "5")
                {
                    count += 1;
                }

                if(count == 2)
                {
                    if(input[i] == "7")
                    {
                        Flag = true;
                    }
                    else
                    {
                        Flag = false;
                    }
                }
            }
            WriteLine(Flag);
        }
    }
}