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20 lines
230 B
C++
20 lines
230 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int a, n, ans;
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int main() {
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cin >> a;
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while (cin >> n, n <= 0) {}
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for (int i = 0; i < n; i++) {
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ans += i + a;
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}
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cout << ans << endl;
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return 0;
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}
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