public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  n = sc . nextInt ( ) ;
  m = sc . nextInt ( ) ;
  e = new Edge [ m ] ;
  dis = new long [ n ] ;
  Arrays . fill ( dis , inf ) ;
  dis [ 0 ] = 0 ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int a = sc . nextInt ( ) ;
    int b = sc . nextInt ( ) ;
    int c = sc . nextInt ( ) ;
    e [ i ] = new Edge ( a - 1 , b - 1 , - c ) ;
  }
  sc . close ( ) ;
  if ( bellmanFord ( ) ) {
    System . out . print ( "inf" ) ;
  }
  else {
    System . out . println ( - dis [ n - 1 ] ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; n = sc . nextInt ( ) ; m = sc . nextInt ( ) ; e = new Edge [ m ] ; dis = new long [ n ] ; Arrays . fill ( dis , inf ) ; dis [ 0 ] = 0 ; for ( int i = 0 ; i < m ; i ++ ) { int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int c = sc . nextInt ( ) ; e [ i ] = new Edge ( a - 1 , b - 1 , - c ) ; } sc . close ( ) ; if ( bellmanFord ( ) ) { System . out . print ( " inf " ) ; } else { System . out . println ( - dis [ n - 1 ] ) ; } }
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