input:

10
50 145
1 6
1 33
1 38
2 11
2 29
2 36
2 42
3 20
3 35
3 36
4 39
5 39
6 10
6 23
6 27
6 34
6 39
6 45
6 47
7 24
7 37
8 14
8 47
9 3
9 40
10 5
10 12
10 25
11 14
11 18
12 13
12 44
13 38
14 38
15 4
15 29
15 31
15 36
15 44
16 17
16 35
17 18
17 50
18 3
18 19
18 20
18 27
19 31
20 22
20 31
21 8
21 22
21 27
21 ...

output:

result:

wrong answer 1st lines differ - expected: '159936', found: ''