11. sum of four numbers
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1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
4
2
1
2
1
2
0
0
0
0
0
0
1
2
1
2
0
0
0
0
0
6
3
1
2
3
4
0
0
0
0
0
0
1
2
3
4
0
0
0
0
0
10
4
3
7
4
6
0
0
0
0
0
0
3
7
4
6
0
0
0
0
0
20
0
0
1
2
3
4
5
6
7
8
9