#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define READ_BUFSIZE ( 16 )
#define READ_DELIMITER ( " " )


//標準入力取得（１行）

int GetStdin( char* pszStr, int lMaxLen )
{
	int lLen = 0;

    memset( pszStr, 0, lMaxLen );
    if( fgets( pszStr, lMaxLen, stdin ) )
    {
	    lLen = strlen( pszStr );
	    if( lLen >= 1 )
	    {
			if( pszStr[ lLen - 1 ] == 0x0A )
			{
				pszStr[ lLen - 1 ] = 0;
				lLen--;
			}
		}
	}
	
	return( lLen );
}

//int型のスワップ
void swap( int &i, int &j )
{
	int k = i;
	i = j;
	j = k;

}


void sort( int lInput[], int lNum )
{
	for( int i = 0; i < lNum; i++ )
	{
		for( int j = lNum-1; j >= i+1; j-- )
		{
			if( lInput[ j ] < lInput[ j-1 ] )
				swap( lInput[j] , lInput[ j-1 ] );
		}
	}
}


int main(int argc, char *argv[]) 
{
	char szRead[READ_BUFSIZE] = "";
	//char* psOutbuf[10000] = { 0 };
	int lInput[4] = {0};

	GetStdin( szRead, READ_BUFSIZE );
	int N = atoi( szRead );

	GetStdin( szRead, READ_BUFSIZE );


	int * pn = new int[N];

	for( int i = 0; i < N; i++ )
	{
		GetStdin( szRead, READ_BUFSIZE );
		pn[i] = atoi( szRead );
	}

	sort( pn, N );

	printf( "%d\n", pn[N-1]-pn[0] );


	delete[] pn;
	return 0;

}