public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] [ ] dist = new int [ n ] [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    Arrays . fill ( dist [ i ] , Integer . MAX_VALUE / 3 ) ;
    dist [ i ] [ i ] = 0 ;
  }
  int m = sc . nextInt ( ) ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int a = sc . nextInt ( ) ;
    int b = sc . nextInt ( ) ;
    int t = sc . nextInt ( ) ;
    dist [ a - 1 ] [ b - 1 ] = t ;
    dist [ b - 1 ] [ a - 1 ] = t ;
  }
  for ( int k = 0 ;
  k < n ;
  k ++ ) {
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      for ( int j = 0 ;
      j < n ;
      j ++ ) {
        dist [ i ] [ j ] = Math . min ( dist [ i ] [ j ] , dist [ i ] [ k ] + dist [ k ] [ j ] ) ;
        dist [ j ] [ i ] = dist [ i ] [ j ] ;
      }
    }
  }
  int min = Integer . MAX_VALUE ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int max = 0 ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( max < dist [ i ] [ j ] ) {
        max = dist [ i ] [ j ] ;
      }
    }
    if ( min > max ) {
      min = max ;
    }
  }
  System . out . println ( min ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] [ ] dist = new int [ n ] [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { Arrays . fill ( dist [ i ] , Integer . MAX_VALUE / 3 ) ; dist [ i ] [ i ] = 0 ; } int m = sc . nextInt ( ) ; for ( int i = 0 ; i < m ; i ++ ) { int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int t = sc . nextInt ( ) ; dist [ a - 1 ] [ b - 1 ] = t ; dist [ b - 1 ] [ a - 1 ] = t ; } for ( int k = 0 ; k < n ; k ++ ) { for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { dist [ i ] [ j ] = Math . min ( dist [ i ] [ j ] , dist [ i ] [ k ] + dist [ k ] [ j ] ) ; dist [ j ] [ i ] = dist [ i ] [ j ] ; } } } int min = Integer . MAX_VALUE ; for ( int i = 0 ; i < n ; i ++ ) { int max = 0 ; for ( int j = 0 ; j < n ; j ++ ) { if ( max < dist [ i ] [ j ] ) { max = dist [ i ] [ j ] ; } } if ( min > max ) { min = max ; } } System . out . println ( min ) ; }
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