0
cum
0
2
0
4
3
1
2
3
4
2
0
0
0
0
1
1
1
3
1
2
0
0
2
3
0
1
1
0
1
1
1
1
1
4
1
1
2
0
1
1
1
1
0
1
1
3
2
4
3
