"""
1/1
1/10
2/2
2/11
2/20
3/3
3/12
3/21
3/30
4/4
4/13
4/22
5/5
5/14
5/23
6/6
6/15
6/24
7/7
7/16
7/25
8/8
8/17
8/26
9/9
9/18
9/27
10/19
10/28
11/29
"""
print(30)