1$x = 1;
2print "1\n";
3
4$x = 2;
5print "2\n";
6
7$x = 3;
8print "3\n";
9
10$x = 4;
11print "4\n";
12
13$x = 5;
14print "5\n";
15
16$x = 6;
17print "6\n";
18
19$x = 7;
20print "7\n";
21