public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  map = new int [ n ] [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( i != j ) {
        map [ i ] [ j ] = 1 << 29 ;
      }
    }
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int a = sc . nextInt ( ) - 1 ;
    int b = sc . nextInt ( ) - 1 ;
    int t = sc . nextInt ( ) ;
    map [ a ] [ b ] = t ;
    map [ b ] [ a ] = t ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      for ( int k = j + 1 ;
      k < n ;
      k ++ ) {
        int a = Math . min ( map [ j ] [ k ] , map [ j ] [ i ] + map [ i ] [ k ] ) ;
        map [ j ] [ k ] = a ;
        map [ k ] [ j ] = a ;
      }
    }
  }
  int min = 1 << 29 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int max = 0 ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      max = Math . max ( max , map [ 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 m = sc . nextInt ( ) ; map = new int [ n ] [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { if ( i != j ) { map [ i ] [ j ] = 1 << 29 ; } } } for ( int i = 0 ; i < m ; i ++ ) { int a = sc . nextInt ( ) - 1 ; int b = sc . nextInt ( ) - 1 ; int t = sc . nextInt ( ) ; map [ a ] [ b ] = t ; map [ b ] [ a ] = t ; } for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { for ( int k = j + 1 ; k < n ; k ++ ) { int a = Math . min ( map [ j ] [ k ] , map [ j ] [ i ] + map [ i ] [ k ] ) ; map [ j ] [ k ] = a ; map [ k ] [ j ] = a ; } } } int min = 1 << 29 ; for ( int i = 0 ; i < n ; i ++ ) { int max = 0 ; for ( int j = 0 ; j < n ; j ++ ) { max = Math . max ( max , map [ i ] [ j ] ) ; } if ( min > max ) { min = max ; } } System . out . println ( min ) ; }
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