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22 lines
506 B
C++
22 lines
506 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 1e5 + 10;
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int vis[N];
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int main()
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{
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for (int i = 2; i < N; i++)
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for (int j = i + i, t = 2; j < N; j += i, t++)
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vis[j] += t;
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int n;
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while (cin >> n)
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{
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long long sum = 0;
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for (int i = 2; i <= n; i++)
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sum += vis[i];
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cout << (sum * 4 + n - 1) << endl;
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}
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return 0;
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}
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