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#include <iostream>
using namespace std;
int main() {
int l, i, b, с, d, f = 0;
cin>> l;
if (l > 0 && l != 0)
{
for (i = 1; i <= l; i++)
f += i;
}
else
{
for (i = 1; i >= l; i--)
f += i;
}
cout<< f;
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