View Code of Problem 30

#include<bits/stdc++.h>
using namespace std;

int main (){
	int n;
	while(~scanf("%d", &n)){
		long long sum = 0;
		for(int i = 1;i <= n;i++){
			sum += i;
		}
		cout<<sum<<endl;
	}

	return 0;
}

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