public static void main ( String ... args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int [ ] [ ] times = new int [ n ] [ n ] ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int a = sc . nextInt ( ) ;
    int b = sc . nextInt ( ) ;
    int t = sc . nextInt ( ) ;
    times [ a - 1 ] [ b - 1 ] = t ;
    times [ b - 1 ] [ a - 1 ] = t ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( i != j && times [ i ] [ j ] == 0 ) {
        times [ i ] [ j ] = 1000000 ;
        times [ j ] [ i ] = 1000000 ;
      }
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      for ( int k = 0 ;
      k < n ;
      k ++ ) {
        times [ j ] [ k ] = Math . min ( times [ j ] [ k ] , times [ j ] [ i ] + times [ i ] [ k ] ) ;
        times [ k ] [ j ] = times [ j ] [ k ] ;
      }
    }
  }
  int min = Integer . MAX_VALUE ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int tmpmin = 0 ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( i != j ) tmpmin = Math . max ( tmpmin , times [ i ] [ j ] ) ;
    }
    min = Math . min ( tmpmin , min ) ;
  }
  System . out . println ( min ) ;
}

public static void main ( String ... args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int [ ] [ ] times = new int [ n ] [ n ] ; for ( int i = 0 ; i < m ; i ++ ) { int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int t = sc . nextInt ( ) ; times [ a - 1 ] [ b - 1 ] = t ; times [ b - 1 ] [ a - 1 ] = t ; } for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { if ( i != j && times [ i ] [ j ] == 0 ) { times [ i ] [ j ] = 1000000 ; times [ j ] [ i ] = 1000000 ; } } } for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { for ( int k = 0 ; k < n ; k ++ ) { times [ j ] [ k ] = Math . min ( times [ j ] [ k ] , times [ j ] [ i ] + times [ i ] [ k ] ) ; times [ k ] [ j ] = times [ j ] [ k ] ; } } } int min = Integer . MAX_VALUE ; for ( int i = 0 ; i < n ; i ++ ) { int tmpmin = 0 ; for ( int j = 0 ; j < n ; j ++ ) { if ( i != j ) tmpmin = Math . max ( tmpmin , times [ i ] [ j ] ) ; } min = Math . min ( tmpmin , min ) ; } System . out . println ( min ) ; }
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