using System;

public class Program

{

public static int Sod1 ( int [ ] a , int k ) 

​

​

{ 

​

if ( k == 0 ) 

​

return a [ k ] ;

​

 return a [ k ] + Sod1( a , k - 1 ) ;

​

 }

​

​

public static bool Sod2 ( int [ ] a , int n )

​

{

​

if(n==0)

​

 return true ; 

​

if ( a [ n ] % 10 != Sod1( a , n - 1 ) % 10 ) 

​

return false ; 

​

return Sod2 ( a , n - 1 ) ; 

​

}

​

public static void Main ( string [ ] args ) 

​

{

​

int [ ] a = {4, 24, 8, 26 ,42};

​

 Console.WriteLine ( Sod2 ( a , a.Length - 1 ) );

​

}

}