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c_cpp
2 years ago
247 B
4
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#include <iostream>
using namespace std;
int main()
{
int n;
int b=0;
int i;
cin >> n;
if (n>0 && n!=0)
{
for (i =1; i<=n; i++)
b +=i;
}
else
{
for (i=1; i>=n; i--)
b+=i
}
cout << b;
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