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Description

You are to write a program, which, given N positive integer values $X_1$ , $X_2$ , …, $X_N$, compute the number of distinct values in those N integer values.

Format

Input

Your program reads input from standard input. The first line contains one integer: the number N , 2 ≤ N ≤ 1000. The following N lines represent the values $X_1$ , $X_2$ , …, $X_N$ , and each of these lines contains one integer: a value $X_i$ , 1 ≤ $X_i$ ≤ 10000.

Output

Your program writes output to standard output. The output contains one integer: the number of distinct values in $X_1$ , $X_2$ , …, $X_N$.

Samples

10
1
2
3
4
5
4
3
2
1
2

5

5
123
321
123
231
321

3

Limitation

If the output is correct, you get full score for the test case. Otherwise the score for the test case is 0.