function almostIncreasingSequence(sequence) {
 var counter = 0;
 for (var i = 0; i < sequence.length -1; i++ ) {
 	if (sequence[i] !== (sequence[i+1] - 1)) {

 		console.log('nie działam dla liczby ' + sequence[i] +' i nastepujacej po niej liczbie ' + sequence[i+1] + '. Zwiekszam counter o 1')
 		counter = counter +1 ;
 		console.log(counter)

 	} else {
 		console.log('działam dla liczby ' + sequence[i] +' i nastepujacej po niej liczbie ' + sequence[i+1])
 	}
 }


 if ( counter > 1) {
 	console.log('dupa');
 	return false;
 } else {
 	console.log('sukces');
 	return true;
 }

}

almostIncreasingSequence([1,2,3,4,6])