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#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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int main()
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{
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unsigned x;
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while (~scanf("%u", &x))
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printf("%u\n\n", x * (x + 1) / 2);
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return 0;
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}
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