12 lines
186 B
C++
12 lines
186 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int n;
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int sum;
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int main() {
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cin >> n;
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for (int i = 1; i <= n; i += 2) sum += i;
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printf("%d", sum);
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return 0;
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}
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