2
cum
0
1
2
1
0
2
1
0
0
0
0
1
1
2
0
3
0
3
5
1
2
1
2
4
2
0
2
2
0
0
0
0
1
0
0
0
1
1
0
1
1
1
1
0
0
0
3
1
0
