static int fib ( int n ) {
  int a = 0 , b = 1 , c ;
  if ( n == 0 ) return a ;
  for ( int i = 2 ;
  i <= n ;
  i ++ ) {
    c = a + b ;
    a = b ;
    b = c ;
  }
  return b ;
}

static int fib ( int n ) { int a = 0 , b = 1 , c ; if ( n == 0 ) return a ; for ( int i = 2 ; i <= n ; i ++ ) { c = a + b ; a = b ; b = c ; } return b ; }
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