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12 lines
174 B
C++
12 lines
174 B
C++
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#include <iostream>
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using namespace std;
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int n;
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int main()
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{
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while(scanf("%d",&n) != EOF)
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{
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cout<<(n*n*n + 5*n + 6)/6<<endl;
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}
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return 0;
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}
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