Count of Matches in Tournament LeetCode solution in C++

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class Solution {
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 public:
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  int numberOfMatches(int n) {
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    int count = 0;
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    while (n > 1) {
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      if (n % 2 == 0) {
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        int a = n / 2;
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        n = n / 2;
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        count = count + a;
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      } else {
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        int a = (n - 1) / 2;
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        n = a + 1;
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        count = count + a;
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      }
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    }
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    return count;
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  }
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};