Problem Statement

Print how many distinct integers there are in given five integers A, B, C, D, and E.

Input

Input is given from Standard Input in the following format:
A B C D E

Output

Print the answer.

Constraints

• $0 \leq A, B, C, D, E \leq 100$
• All values in input are integers.

Sample Input 1

31 9 24 31 24

Sample Output 1

3

In the given five integers 31, 9, 24, 31, and 24, there are three distinct integers 9, 24, and 31.
Thus, 3 should be printed.

Sample Input 2

0 0 0 0 0

Sample Output 2

1

见题面 Input 部分

见题面 Output 部分