{"raw_statement":[{"iden":"problem statement","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 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.\nLunlun 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?"},{"iden":"constraints","content":"*   $1 ≤ N ≤ 100$\n*   $1 ≤ d_i ≤ 100$\n*   All input values are integers."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$\n$d_1$\n$:$\n$d_N$"},{"iden":"sample input 1","content":"4\n10\n8\n8\n6"},{"iden":"sample output 1","content":"3\n\nIf 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."},{"iden":"sample input 2","content":"3\n15\n15\n15"},{"iden":"sample output 2","content":"1\n\nWhen all the mochi have the same diameter, we can only have a $1$\\-layered kagami mochi."},{"iden":"sample input 3","content":"7\n50\n30\n50\n100\n50\n80\n30"},{"iden":"sample output 3","content":"4"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}