Problem:
Score : 100 points

Problem Statement

Shichi-Go-San (literally "Seven-Five-Three") is a traditional event in a certain country to celebrate the growth of seven-, five- and three-year-old children.

Takahashi is now X years old. Will his growth be celebrated in Shichi-Go-San this time?

Constraints

1 ≤ X ≤ 9

X is an integer.

Input

Input is given from Standard Input in the following format:

X

Output

If Takahashi's growth will be celebrated, print YES; if it will not, print NO.

Sample Input 1

5

Sample Output 1

YES

The growth of a five-year-old child will be celebrated.

Sample Input 2

6

Sample Output 2

NO

See you next year.

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <cstdio>
#include <iostream>
using namespace std;

int main(){
    int X;
    cin >> X;

    int flag = 0;
    if(X == 3){
       cout << "Yes" << endl; 
       flag = 1;
    }
    if(X == 5){
       cout << "Yes" << endl; 
       flag = 1;
    }
    if(X == 7){
       cout << "Yes" << endl; 
       flag = 1;
    }

    if(flag != 1){
        cout << "No" << endl;
    }

    return 0;
}