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15 lines
156 B
15 lines
156 B
2 years ago
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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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long long n,sum=0;
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scanf("%I64d",&n);
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sum=((n+1)*n)/2;
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printf("%I64d",sum);
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return 0;
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}
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