Uva 10079 – Pizza Cutting

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 // Verdict: Accepted
 // Time: 0.00
 #include <bits/stdc++.h>
 using namespace std;

int main()
 {
 long long n;

while (1==(scanf("%lld",&n)))
 {
 long long s;

if (n<0) break;

s = (n*(n+1))/2;

cout << s+1 << endl;
 }

return 0;
 }

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