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#include <iostream>
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using namespace std;
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int main() {
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int n, cnt = 0;
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cin >> n;
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cnt = n / 3;
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if (n == 2)
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cnt = -1;
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else if (n == 4)
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cnt = 4;
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else if (n % 3 == 1)
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cnt += 1;
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else if (n % 3 == 2)
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cnt += 2;
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cout << cnt << endl;
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return 0;
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} |
