15 lines
393 B
C++
15 lines
393 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int n, cnt;
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int main() {
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cin >> n;
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for (int i = 1; i <= n; i++)//首位不能是0
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for (int j = 0; j <= n; j++)//二位可以是0
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for (int k = 1; k <= n; k += 2) //三位必须是奇数，1，3，5，7，...
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if (k != i && k != j && i != j) cnt++;
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cout << cnt << endl;
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return 0;
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} |