Kagami Mochi

AtCoder

IDabc085_b

Time2000ms

Memory256MB

Difficulty—

An _$X$\-layered kagami mochi_ $(X ≥ 1)$ is a pile of $X$ round mochi (rice cake) stacked vertically where each mochi (except the bottom one) has a smaller diameter than that of the mochi directly below it. For example, if you stack three mochi with diameters of $10$, $8$ and $6$ centimeters from bottom to top in this order, you have a $3$\-layered kagami mochi; if you put just one mochi, you have a $1$\-layered kagami mochi. Lunlun the dachshund has $N$ round mochi, and the diameter of the $i$\-th mochi is $d_i$ centimeters. When we make a kagami mochi using some or all of them, at most how many layers can our kagami mochi have? ## Constraints * $1 ≤ N ≤ 100$ * $1 ≤ d_i ≤ 100$ * All input values are integers. ## Input Input is given from Standard Input in the following format: $N$ $d_1$ $:$ $d_N$ [samples]

Samples

Input #1

Output #1

3

If we stack the mochi with diameters of $10$, $8$ and $6$ centimeters from bottom to top in this order, we have a $3$\-layered kagami mochi, which is the maximum number of layers.

Input #2

Output #2

1

When all the mochi have the same diameter, we can only have a $1$\-layered kagami mochi.

Input #3

Output #3

API Response (JSON)

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    {
      "statement_type": "Markdown",
      "content": "An _$X$\\-layered kagami mochi_ $(X ≥ 1)$ is a pile of $X$ round mochi (rice cake) stacked vertically where each mochi (except the bottom one) has a smaller diameter than that of the mochi directly bel...",
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