use bignum;

$e=0;

while(<>){
	
	($n,$m)=split/ /;
	($n or $m) or last; # break if 0 0
	
	$f=0;
	for $i(1..$n){
		$_=<>;
		chomp;
		/ (\d+) (\d+)$/;  # read two numbers to $1 and $2
		$m-=$1;
		if ($m<0){ $f=1 }
		$m+=$2;
		}
		
	$e++>0 and 
	print "\n";
	
	print $f ? "Fail":"Success";
	
	}